Kohler 20RCA troubleshooting: 142 fault codes and 146 symptom-cause-remedy entries from the manufacturer's own service documentation.
Kohler 20RCA — full specs, parts & maintenance.
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| Emerg Stop Shutdwn | Emerg Stop Shutdwn | Reset the emergency stop switch(es) and reset the controller by pressing the OFF/RESET button | |
| Accy PwrOver Warning | Accy PwrOver Warning | Controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler dealer for service |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown | Controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler dealer for service |
| BusDeadLive | The bus is measured to be dead when one of the generators is supposed to be supplying voltage to the bus (closed contactor). | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. | |
| BusLiveDead | The bus is measured to be live when no generators are connected to it (both contactors open). | Bus metering V9A and V9B connections to V9 of paralleling protection harness are connected incorrectly. | |
| CfgModelNum | The two generators that are intended to be paralleled have incompatible model numbers. | Incorrect configuration of one of the generators. Different generator types. The paralleled generator sets must be the same kW model. (i.e. two 14 kW or two 20 kWor 26 kW models). | |
| CfgSysVolt | The system voltage of the two generators intended to be paralleled is not the same. | One of the two generators is incorrectly configured. Intermittent connections on RBUS network wiring. | |
| ConCheckFail | Failure to Auto-Discover APM connections. | Wires 9A and 9B crossed between the generators. Wires 9A or 9B not connected. | |
| ConNotDeterm | APM connection auto-discovery is not complete. This means that the generator does not know which contactor is connected to it. | Generators not yet started in RUN with other generator in OFF. See the APM instruction sheet for instructions to perform the auto-discovery procedure. | |
| ContactorOk | Successful auto-discovery of APM connections. | Auto-discovery was activated by placing other generator in OFF and this generator in RUN. | |
| ErraticSig | The power metering on this controller gives a signal that is not consistent with the system configuration. Reversing the power direction does not resolve the problem. | Bad wiring to the CT. Too much tension on wires from the CT to the controller. | |
| LossOfComAPM | The Automatic Paralleling Module has stopped communicating on RBUS. (An APM was detected on the RBUS network but is no longer communicating). | APM is unplugged. Primary controller is powered down. Check the battery connections. See previous page for more information. Intermittent connections on RBUS network wiring. | |
| LossOfComm2 | The primary controller has lost communication with the secondary controller. (A secondary controller was detected, then communication was lost.) | RBUS disconnected, secondary controller battery disconnected, updating firmware in secondary controller, or intermittent RBUS connections. | |
| LossOfField | This generator has absorbed more than 25% reactive power (magnetic excitation current) for 20 seconds. | Generator voltage on this generator is not calibrated correctly. Generator voltage on other generator is not calibrated correctly. Bus voltage on this generator is not calibrated correctly. Bus voltage on the other generator is not calibrated correctly. | |
| MeteringOk | The generator has verified that the metering is connected correctly and that the direction is consistent with expected power direction. | Status message indicates that the CT is connected to the generator correctly. | |
| MeterUnknown | This generator does not know if the metering is connected or the orientation of the connection. This means that the generators can’t share load accurately until this information is known. | System commissioning and startup not yet complete. See the APM instructions. | |
| NoCurrent | The generator has applied load (using the other generator) and has observed no current on the power sensing inputs. | The CT is not connected to the controller. The output leads from the generator do not go through the CT in the correct direction. See the APM instructions. | |
| SyncFailure | The generator has been attempting to synchronize for over 2 minutes without success. | Generator is hunting. Advanced speed control settings need adjustment. Load is changing frequently to disturb the online generator. | |
| AC Sens Loss Shutdwn | Loss of AC sensing shutdown — Shutdown: The controller shut down the generator because there was less than 5% of rated voltage measured on Phase A for 3 seconds, only in AUTO, only after acceptable voltage (> 5% of UV setting) has been detected. | Check for loose wiring and connections; Check all AC leads; Troubleshoot alternator. | |
| AC Sens Loss Warning | Loss of AC sensing warning — Warning: The controller has measured less than 5% of rated voltage on Phase A for 1 second, 10 seconds after crank disconnect. | Check for loose wiring and connections; Check all AC leads; Troubleshoot alternator. | |
| AccyPwrOver Warning | Accessory Power Overload — Warning: An overcurrent fault (short circuit) on the accessory controller power output. | Check wiring to RBUS accessories; Troubleshoot the RBUS accessories; refer to the documentation provided with the accessories. | |
| ATS ComError Warning | ATS communication error — Warning: The controller has lost communication with the RXT ATS that had previously been communicating properly. | Check connection to ATS module. | |
| ATS Fail Xfr Warning | ATS fail to transfer — Warning: The RXT ATS has reported a fail to transfer, the digital output for ATS Fail To Transfer (PIM) is active (contacts closed). | Consult ATS manual for troubleshooting. | |
| ATS PhaseRot Warning | Warning: The RXT ATS has reported a phase rotation mismatch (3-phase only) and the ATS will not transfer. | Check wiring to the ATS; Consult ATS manual for troubleshooting. | |
| Aux Input Shutdwn | Auxiliary input shutdown — Shutdown: The controller shut down the generator because the digital input for a custom shutdown (AuxiliaryInputShutdown - PIM) was activated (low). | Check customer equipment connected to the PIM module. | |
| Aux Input Warning | Auxiliary input warning — Warning: The digital input for a custom warning (AuxiliaryInputWarning - PIM) is active (low). | Check customer equipment connected to the PIM module. | |
| Batt Chg Flt Warning | Battery charger fault warning — Warning: The digital input for Battery Charger Fault Warning (PIM) is active (low). For an external battery charger only, not applicable to the RDC2 built-in battery charging. | Check customer equipment connected to the PIM module. | |
| Battery High Warning | Warning: The controller has measured battery voltage that is above the high warning setting for 10 seconds or more. Operates during exercise and normal operation. | Check engine starting battery. | |
| Battery CRLow Warning | Warning: Battery voltage dropped to 11 VDC or less for 30 seconds or more. | Check engine starting battery; Check battery charger DC output voltage from RDC2. See Section 5.12.2. | |
| Battery Low Warning | Warning: The controller has measured battery voltage that is below the low warning setting for 90 seconds or more. | Check engine starting battery; Check battery charger DC output voltage from RDC2. See Section 5.12.2. | |
| Chk DateTime Warning | Check date and time warning — Warning: DC power to the controller has been interrupted and the date and time may not be correct. Event history may not have accurate time/date stamps. | Verify the time and date settings to ensure proper operation of scheduled operations and for event history logging. | |
| Default Pars Warning | Default Parameters — Warning: The controller has been loaded with default parameters. | Configure settings as required for desired operation. | |
| Emerg Stop Shutdwn | Shutdown: The optional emergency stop button has been pressed or emergency stop leads ESS and/or ESN are not connected. | Reset the emergency stop button and clear the fault as described in Section 5.6; Check lead ESS and ESN connections to the emergency stop button. If there is no E-stop button, connect ESS and ESN together. | |
| Engine M/N Invalid Shutdwn | Shutdown: Generator model number has not been entered. (Engine model number is selected automatically based on generator set model.) | Enter the generator set model number from the RDC2 keypad, or use SiteTech to select the genset model number. | |
| Engine Speed High Shutdwn | Shutdown: The controller shut down the generator because engine speed, as calculated from AC frequency, was above the high speed setting for 0.3 seconds or more. | Troubleshoot engine operation per the engine service manual. | |
| Engine Speed Low Shutdwn | Shutdown: The controller shut down the generator, after crank disconnect, because engine speed, as calculated from AC frequency, was below the low speed setting for 3 seconds or more. The enclosure thermostat has tripped. | Troubleshoot engine operation per the engine service manual; Check for evidence of high temperatures inside the enclosure. Reset the thermostat. See Section 5.8. | |
| Exer Not Sch Warning | Warning: There is no exercise scheduled. | Set the exercise schedule. | |
| Frequency High Shutdwn | Shutdown: The controller shut down the generator because the frequency measured on Phase A exceeded the high frequency setting for 10 seconds, 10 seconds or more after crank disconnect. | Troubleshoot engine operation per the engine service manual. | |
| Frequency Low Shutdwn | Shutdown: The controller shut down the generator because the frequency measured on Phase A was less than the low limit for 10 seconds or the measured frequency was 10 Hz or more less than rated for 60 seconds or more, 10 seconds or more after crank disconnect. The enclosure thermostat has tripped. | Troubleshoot engine operation per the engine service manual; Check for evidence of high temperatures inside the enclosure. Reset the thermostat. See Section 5.8. | |
| Fuel Leak Shutdwn | Shutdown: The controller shut down the generator because the digital input for Fuel Tank Leak Shutdown (PIM) was activated (low). | Check customer equipment connected to the PIM module. | |
| Fuel Leak Warning | Warning: The digital input for Fuel Tank Leak Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. | |
| Fuel Level CrHi Warning | Warning: The digital input for Critically High Fuel Level Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. | |
| Fuel Level High Warning | Warning: The digital input for High Engine Fuel Level Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. | |
| Fuel Level Low Shutdwn | Shutdown: The controller shut down the generator because the digital input for Low Fuel Level Shutdown (PIM) was activated (low). | Check customer equipment connected to the PIM module. | |
| Fuel Level Low Warning | Warning: The digital input for Low Fuel Level Warning (PIM) is active (low). | Check customer equipment connected to the PIM module. | |
| GenBrkerOpen Warning | Generator Circuit Breaker Open — There is voltage at the generator set but no voltage measured on the emergency side of the ATS (Model RXT transfer switch required) | Check line circuit breaker; Check for and correct short circuits or overloading on the load side before resetting the circuit breaker | |
| Ground Fault Warning | The digital input for Ground Fault Warning (PIM) is active (low) | Check customer equipment connected to the PIM module | |
| High Lube Oil Temperature Warning | Oil temperature higher than 300_F (149_C) | See Overheats in the troubleshooting charts in Section 5.14 | |
| High Lube Oil Temperature Shutdown | Oil temperature higher than 325_F (163_C) | ||
| Lo Crank Vlt Warning | During cranking, the controller measured battery voltage less than 60% (7.2V or 14.4V) for 6 seconds or more during cranking | Check cranking battery | |
| Locked Rotor Shutdwn | The controller shut down the generator because no rotation of the engine or alternator was detected, for 3 seconds or more, during cranking | Check cranking circuit; Troubleshoot the engine. See Engine Service Manuals; Check alternator connections to controller and auxiliary winding circuit breaker; Troubleshoot the alternator | |
| MainPwrOverL Shutdwn | The internal current limit circuit has tripped, indicating an overcurrent condition on the DC power supply circuit | Check crank, run, and flash relay circuits for short circuits. See Section 5.12.1 | |
| Maint Req'd Warning | Engine run time, or calendar days, has exceeded the maintenance reminder setting | Change the oil and perform other maintenance according to the service schedule in Section 2.1 and in the engine manuals; Reset the maintenance timer after service. See Section 2.7.5 | |
| Not In Auto Warning | The RDC2 controller is not in AUTO. The generator will not start from an ATS or remote device. The digital output for Not In Auto (PIM) is active (contacts closed) | Press the Auto button to ensure automatic system operation | |
| OB1 CommLoss | Communication with option board #1 has been lost | Check RBUS wiring to inoperative option board | |
| OB2 CommLoss | Communication with option board #2 has been lost | Check RBUS wiring to inoperative option board | |
| OB3 CommLoss | Communication with option board #3 has been lost | Check RBUS wiring to inoperative option board | |
| OB4 CommLoss | Communication with option board #4 has been lost | Check RBUS wiring to inoperative option board | |
| Oil Level Low Shutdwn | The controller shut down the generator because the digital input for Low Oil Level Shutdown (PIM) was activated (low) | Check customer equipment connected to the PIM module | |
| Oil Level Low Warning | The digital input for Low Oil Level Warning (PIM) is active (low) | Check customer equipment connected to the PIM module | |
| Oil Pressure Low Shutdwn | The low oil pressure switch was closed for 5 seconds or more, indicating low oil pressure. Function is inhibited until 30 seconds after crank disconnect | Check for oil leaks; Check the oil level and add oil if low; Check the oil pressure sensor; see Engine Service Manuals | |
| Oil Pressure OpenCR Warning | Oil pressure switch closure has not been detected after shutdown | Check the oil pressure switch connection. Test the LOP switch as described in Section 6.10.2 | |
| Over Crank Shutdwn | The engine did not start during the crank cycle. Time delay is 15 seconds. If noted on the first engine crank cycle, an alternator issue may be indicated | Check the alternator; see Section 6 for alternator test procedures; Check fuel supply. Check cranking circuit. Check cranking battery. Troubleshoot engine; see Engine Service Manuals | |
| RBUS ComError Warning | The controller has lost communication with an RBUS device that had previously been communicating properly | Check connection to the RBUS device | |
| Spd Sens Flt Shutdwn | Speed sensor fault — The controller shut down the generator because the speed signal was lost | Check leads 55, 66, F+, and F- between the alternator and the controller. This fault also occurs if the engine stalls; check the engine and see the troubleshooting chart in Section 5.14 | |
| Volts L1-L2 (AB) High Shutdwn | The controller shut down the generator because the voltage measured from Phase A to Phase B exceeded the high limit for a time greater than the delay setting 2 seconds | Troubleshoot alternator. See Section 5.14, Troubleshooting Charts, and Section 6, Component Testing and Adjustment | |
| Volts L1-L2 (AB) Low Shutdwn | The controller shut down the generator because the voltage measured from Phase A to Phase B was greater 5% of rated, but less than the low voltage setting for a time greater than the delay setting 10 seconds | The enclosure thermostat has tripped | Troubleshoot alternator. See Section 5.14, Troubleshooting Charts, and Section 6, Component Testing and Adjustment; Check for evidence of high temperatures inside the enclosure. Reset the thermostat. See Section 5.8 |
| Current A High Warning | Over Current | ||
| Frequency High Warning | Over Frequency | ||
| Frequency Low Warning | Under Frequency | ||
| Reactive Power Low Warning | Loss of Field | ||
| Real Power High Warning | Over Power | ||
| Real Power Low Warning | Reverse Power | ||
| Voltage L1-L2 High Warning | Over Voltage | ||
| Voltage L1-L2 Low Warning | Under Voltage | ||
| BusLiveDead | The bus is measured to be live when no generators are connected to it (both contactors open) | Bus metering V9A and V9B connections to V9 of paralleling protection harness connected incorrectly | |
| CfgModelNum | The two generators that are intended to be paralleled have incompatible model numbers | Incorrect configuration of one of the generators. Different generator types | The paralleled generator sets must be the same kW model. (i.e. two 14 kW or two 20 kW models.) |
| CfgSysVolt | The system voltage of the two generators intended to be paralleled is not the same. Because the system does not know which voltage is correct, the generators will not be allowed to start | One of the two generators is incorrectly configured; Intermittent connections on RBUS network wiring | |
| ChkngMeter | This generator has paralleled to the other generator and is verifying that the metering is connected and establishing the connection direction | Status message appears the first time the two generators are paralleled | |
| ConCheckFail | Failure to Auto-Discover APM connections | Wires 9A and 9B crossed between the generators; Wires 9A or 9B not connected | |
| ConChecking | Performing APM connection auto-discovery | This generator has started in RUN, the other generator is in OFF | |
| ConNotDeterm | APM connection auto-discovery is not complete. This means that the generator does not know which contactor is connected to it | Generators not yet started in RUN with other generator in OFF | See the APM instruction sheet for instructions to perform the auto-discovery procedure |
| ContactorOk | Successful auto-discovery of APM connections | Auto-discovery was activated by placing other generator in OFF and this generator in RUN | |
| ErraticSig | The power metering on this controller gives a signal that is not consistent with the system configuration. Reversing the power direction does not resolve the problem | Bad wiring to the CT; Too much tension on wires from the CT to the controller | |
| LossOfComAPM | The Automatic Paralleling Module has stopped communicating on RBUS. (An APM was detected on the RBUS network but is no longer communicating.) | APM is unplugged; Primary controller is powered down; Intermittent connections on RBUS network wiring | Check the battery connections. See previous page for more information; Check RBUS communication connections |
| LossOfField | This generator has absorbed more than 25% reactive power (magnetic excitation current) for 20 seconds | Generator voltage on this generator is not calibrated correctly; Generator voltage on other generator is not calibrated correctly; Bus voltage on this generator is not calibrated correctly; Bus voltage on the other generator is not calibrated correctly | |
| MeteringOk | The generator has verified that the metering is connected correctly and that the direction is consistent with expected power direction | Status message indicates that the CT is connected to the generator correctly | |
| MeterUnknown | This generator does not know if the metering is connected or the orientation of the connection. This means that the generators can't share load accurately until this information is known | System commissioning and startup not yet complete | See the APM instructions |
| NoCurrent | The generator has applied load (using the other generator) and has observed no current on the power sensing inputs | The CT is not connected to the controller; The output leads from the generator do not go through the CT in the correct direction | See the APM instructions |
| SyncFailure | The generator has been attempting to synchronize for over 2 minutes without success | Generator is hunting; Advanced speed control settings need adjustment; Load is changing frequently to disturb the online generator | |
| Always Off | OnCue Plus has been used to control this PIM digital output. The digital output is no longer controlled by the generator set. Applies to digital outputs B3 through B6 on the PIM only | Click on the PIM output in OnCue Plus to turn the output on or off. See the OnCue Plus Operation Manual; To reset the PIM digital output to a function controlled by the generator set, use SiteTech software to re-assign the output event | |
| Always On | Always On | ||
| Auto Locked | Chicago Code Active — The digital output for Chicago Code Active (PIM) is active (contacts closed), indicating the digital input for Chicago Code Active (PIM) is active (low) and thus master switch is locked in the AUTO position | Check customer equipment connected to the PIM module | |
| Common Fault | The digital output for Common Fault (PIM) is active (contacts closed), indicating the generator is shutdown for any (all) fault | Check for faults and troubleshoot any/all fault conditions individually | |
| Common Warng | The digital output for Common Warning (PIM) is active (contacts closed), indicating that any (all) warning is active | Check for warnings and troubleshoot any/all warning conditions individually | |
| Emerg Pwr On | Emergency Power System Supplying Load — The digital output for EPS Supplying Load (PIM) is active (contacts closed), indicating there is current output (>5%) from the alternator, only if CTs are installed | ||
| Eng Cooldown | The digital output for Engine Cooldown Active (PIM) is active (contacts closed), indicating the generator is running in cooldown. (Delay 5 min.) | Check remote start circuit if it was expected that the generator should be running; Consult ATS operations manual | |
| Fuel Spill | The digital output for Fuel Spill (PIM) is active (contacts closed), indicating any of the digital inputs for Fuel Tank Leak Warning, Fuel Tank Leak Shutdown, Engine Fuel Level Warning or Engine Fuel Level Critically High (PIM) is active (low) | Check customer equipment that is connected to the Fuel Tank Leak Warning, Fuel Tank Leak Shutdown, Engine Fuel Level Warning or Engine Fuel Level Critically High input on the PIM | |
| Generator Management Off | This generator has been stopped by generator management because it is not presently needed to supply the load. The generator is available and will start if it is needed again | ||
| ProtectiveRelayTrippedContactor | The contactor has been forced to open to protect one of the generators or the customer's load | ||
| Synchronizing | The generator is actively trying to match frequency, voltage and phase with that of the paralleling bus | ||
| Unloading | The generator is actively trying to transfer load from itself to the other generator | ||
| Main Power Overload Shutdown | The generator shuts down due to a main power overload. | Check the circuit breaker and ensure it is not tripped. If necessary, replace the circuit breaker. | |
| Battery Low Warnings | Low battery voltage warnings are displayed on the controller display. | Check the battery connections and ensure they are secure. Replace the battery if it is low on charge. | |
| Faults Related to Paralleling | Paralleling issues occur, such as incorrect synchronization or failure to maintain parallel operation. | Verify that all paralleling settings are correct in the controller parameters. Check the paralleling cables and connections for any faults. | |
| Current A High Warning | Over Current — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Frequency High Warning | Over Frequency — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Frequency Low Warning | Under Frequency — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Reactive Power Low Warning | Loss of Field — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Real Power High Warning | Over Power — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Real Power Low Warning | Reverse Power — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Voltage L1-L2 High Warning | Over Voltage — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| Voltage L1-L2 Low Warning | Under Voltage — Paralleled; 10 sec. delay; display cleared on Press AUTO or OFF | ||
| CfgModelNum | The two generators that are intended to be paralleled have incompatible model numbers | Incorrect configuration of one of the generators; Different generator types; The paralleled generator sets must be the same kW model (i.e. two 14 kW or two 20 kW models) | |
| CfgSysVolt | The system voltage of the two generators intended to be paralleled is not the same; Because the system does not know which voltage is correct, the generators will not be allowed to start | One of the two generators is incorrectly configured; Intermittent connections on RBUS network wiring | |
| ConNotDeterm | APM connection auto-discovery is not complete; This means that the generator does not know which contactor is connected to it | Generators not yet started in RUN with other generator in OFF; See the APM instruction sheet for instructions to perform the auto-discovery procedure | |
| ErraticSig | The power metering on this controller gives a signal that is not consistent with the system configuration; Reversing the power direction does not resolve the problem | Bad wiring to the CT; Too much tension on wires from the CT to the controller | |
| LossOfComAPM | The Automatic Paralleling Module has stopped communicating on RBUS (An APM was detected on the RBUS network but is no longer communicating) | APM is unplugged; Primary controller is powered down; Check the battery connections; Intermittent connections on RBUS network wiring; Check RBUS communication connections | |
| LossOfComm2 | The primary controller has lost communication with the secondary controller (A secondary controller was detected, then communication was lost) | RBUS disconnected, secondary controller battery disconnected, updating firmware in secondary controller, or intermittent RBUS connections | |
| MeterUnknown | This generator does not know if the metering is connected or the orientation of the connection; This means that the generators can’t share load accurately until this information is known | System commissioning and startup not yet complete; See the APM instructions | |
| Generator Management Off | This generator has been stopped by generator management because it is not presently needed to supply the load; The generator is available and will start if it is needed again | ||
| ProtectiveRelayTrippedContactor | The contactor has been forced to open to protect one of the generators or the customer’s load | ||
| Accy PwrOver Warning | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service | |
| MainPwrOverL Shutdown | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service | |
| TP-7092 | Engine starting battery is dead | Check and clean the battery, terminals, cables. If necessary, recharge or replace the battery. | |
| TP-7092 | Loose connections | Tighten all loose connections | |
| TP-7092 | Open circuit breaker | Check and close any open circuit breakers | |
| Accy PwrOver Warning | Accy PwrOver Warning — controller internal circuit protection activated | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown — controller internal circuit protection activated | Controller internal circuit protection activated | Press OFF to reset; Contact an authorized Kohler distributor/dealer for service |
| Volts L1-L2 | Generator voltage high. Output voltage exceeds 120% of the system nominal voltage for more than 2 seconds. | Contact an authorized distributor/dealer for service. | |
| Volts L1-L2 | Generator voltage low. Output voltage falls below 80% of the nominal system voltage for more than 10 seconds. | Reduce the load and restart the generator set. Model 20RCA/20RCAL only: Check enclosure thermostat and reset if tripped. See Section 5.6. | |
| Current A High Warning | Over Current — Paralleled | ||
| Frequency High Warning | Over Frequency — Paralleled | ||
| Frequency Low Warning | Under Frequency — Paralleled | ||
| Reactive Power Low Warning | Loss of Field — Paralleled | ||
| Real Power High Warning | Over Power — Paralleled | ||
| Real Power Low Warning | Reverse Power — Paralleled | ||
| Voltage L1-L2 High Warning | Over Voltage — Paralleled | ||
| Voltage L1-L2 Low Warning | Under Voltage — Paralleled | ||
| TP-7092 | The controller displays fault messages | ||
| Accy PwrOver Warning | Accy PwrOver Warning — controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler distributor/dealer for service | |
| MainPwrOverL Shutdown | MainPwrOverL Shutdown — controller internal circuit protection activated | Press OFF to reset. Contact an authorized Kohler distributor/dealer for service |
| Symptom | Cause | Remedy |
|---|---|---|
| Controller display backlight is off | Backlight turns off after about 1 minute with no activity | Backlight will turn on when a button is pressed or the generator set starts |
| Controller display is off | Low or no battery voltage | Check connections; Check generator set battery. See the Service Views section |
| The generator set does not crank | Battery weak or dead | Recharge or replace the battery. Make sure that the AC power to the generator set controller is backed up by the generator set |
| The generator set does not crank | Battery connections reversed or poor | Check the connections |
| The generator set does not crank | Emergency stop switch activated | Verify that it is safe to start the engine and apply load. Then reset the stop switch or engine shutdown switch |
| The generator set does not crank | Fault shutdown | Check the controller display for fault messages. Correct the fault condition and reset the controller |
| The generator set does not crank | Generator set in the OFF mode | Press the RUN button to start the engine or press AUTO to allow remote starting |
| The generator set does not crank | Generator thermostat tripped | Check for obstructed air inlets and outlets. Reset the thermostat |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Air cleaner clogged | Clean and/or replace the air cleaner |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Battery weak or dead | Recharge or replace the battery |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Battery connection poor | Clean and tighten the battery connections |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Spark plug wire connection loose | Check the spark plug wires |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Low oil pressure shutdown | Check for oil leaks. Check the oil level and add oil if necessary |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Fuel pressure insufficient | Check the fuel supply and valves |
| The generator set cranks but does not start, starts hard, lacks power, or operates erratically | Engine malfunction | Contact an authorized Kohler dealer |
| No AC output | Line circuit breaker in the OFF position | Place the circuit breaker in the ON position |
| No AC output | Line circuit breaker tripping because of overload | Reduce the load on the generator set by unplugging non-essential appliances |
| No AC output | Line circuit breaker tripping because of short circuit | Contact an authorized Kohler dealer for service |
| No AC output | Auxiliary winding circuit breaker tripped | Reset the circuit breaker (located in controller's service access area). Contact an authorized dealer for service if breaker trips repeatedly |
| Low output or excessive drop in voltage | Generator set overloaded | Reduce the load by unplugging non-essential appliances |
| Generator set stops suddenly | Low oil pressure shutdown | Check for oil leaks. Check the oil level and add oil if necessary |
| Generator set stops suddenly | No fuel | Check fuel valves and fuel supply; Check enclosure thermostat and reset if tripped. Check and clear air inlets and exhaust outlets |
| Generator set stops suddenly | Overcrank shutdown | Reset the controller. If the overcrank fault occurs again, contact an authorized Kohler dealer |
| Generator set stops suddenly | Auxiliary winding circuit breaker tripped | Reset the auxiliary winding circuit breaker. Contact an authorized dealer for service if breaker trips repeatedly |
| Generator set stops suddenly | Emergency stop switch activated | Verify that it is safe to start the engine and apply load. Then reset the stop switch or engine shutdown switch |
| Generator set stops suddenly | Fault shutdown | Check the controller display for fault messages. Correct the fault condition and reset the controller |
| Generator set stops suddenly | Generator set in the OFF mode | Press the RUN button to start the engine or press AUTO to allow remote starting |
| Generator set stops suddenly | Remote stop command received from a remote switch, ATS, or OnCue® Plus | Check the remote switch position. Check OnCue® Plus |
| Generator set stops suddenly | Generator thermostat tripped | Check for obstructed air inlets and outlets. Reset the thermostat |
| Generator set stops suddenly | Engine malfunction | Contact an authorized Kohler dealer |
| Overcrank fault | Generator set does not start in three attempts (three crank cycles, 15 seconds crank and 15 seconds off) | See the Faults section |
| Underspeed, underfrequency, or undervoltage fault | Generator thermostat tripped due to excess heat inside the enclosure | Check for blocked air inlets and exhaust outlets. Then follow the procedure to reset the thermostat |
| Inadequate fuel supply | Damaged primary or secondary fuel regulators; loose connections to the fuel solenoid valve; a damaged or closed fuel shutoff valve; an empty LP fuel tank; or other problems with the fuel supply | Check the fuel supply pressure to the generator set. See Section 6.11, Fuel Systems. |
| Fault shutdown | A fault message on the controller display | Identify and correct the cause of the fault condition. Then press the OFF button on the controller to clear the fault. |
| Incorrect controller settings | Always check the controller settings before replacing the controller. See Section 4.3.1 for controller settings. Refer to the operation manual for instructions to check and change the controller settings from the controller keypad, or use a personal computer and Kohler SiteTech software. | |
| Emergency Stop Switch or Engine Stop Switch activated | The generator set may be equipped with an optional emergency stop switch or an engine shutdown switch | Verify that it is safe to start the generator set and apply power to the load before deactivating these switches. |
| Engine hunting (20 kW models) | Controller firmware not the latest version | Verify that the RDC2.4 controller has the latest version of firmware, and update the controller firmware if necessary. |
| Engine hunting (20 kW models) | Engine Speed Gain Adjustment setting not correct | Use SiteTech to check the Engine Speed Gain Adjustment setting. If the setting is not 50, reset to 50 and run the engine again. If the setting is 50, change the value in downward increments of 5; if decreasing the setting is not effective, reset to 50 and increase in increments of 5. |
| Engine hunting (20 kW models) | Dirty air cleaner filter element | Check the air cleaner filter element. Replace the filter element if it is dirty. |
| Engine hunting (20 kW models) | Air intake tube not seated properly on the filter housing or grommet not completely inserted in the housing | Adjust tubing and grommet as needed. |
| Engine hunting (20 kW models) | Unit not set up for the proper fuel source | Verify that the unit is set up for the proper fuel source. LPG: Insert orifice and disconnect ignition timing leads. NG: Remove orifice and connect ignition timing leads. |
| Engine hunting (20 kW models) | Fuel pressure from the source not steady or not at acceptable levels during all phases of operation | Verify the minimum and maximum fuel pressures with the spec sheet. If the pressure varies more than 10% during operation, check the fuel supply and adjust as needed. |
| Engine hunting (20 kW models) | Fuel solenoid valve not opening and closing properly | Energize the fuel solenoid valve to verify that it is opening and closing properly. Replace the fuel solenoid valve if it is not operating correctly. |
| Engine hunting (20 kW models) | Carburetor or intake bolts loose, allowing movement and excess air to be introduced into the system | Reposition the carburetor so that the throttle plate will not touch the carburetor gasket. Apply Loctite to the bolt threads and tighten as needed. |
| Engine hunting (20 kW models) | Throttle plate, linkage between throttle and stepper motor, or stepper motor itself not moving freely | Check for restrictions including linkage and worn bushings. |
| Engine hunting (20 kW models) | Bias spring not in place around both bushings and/or not connected to the holes the bushings are inserted in | Replace bias spring. If in place, try different positions on the throttle linkage plate; if it has no effect, replace bias spring to original position. |
| Engine hunting (20 kW models) | Worn bushings causing excessive movement of the linkage | Replace the bushings. |
| Engine hunting (20 kW models) | Not a controller or governor issue; possible regulator, fuel solenoid, spark plug, or cylinder leak-down problems | Regulator replacement; Fuel solenoid replacement; Spark plug condition check/replacement; Perform a cylinder leak-down test. If none of these procedures remedy the hunting, contact the Kohler Generator Service Department. |
| Engine hunting (20 kW models) | Controller issue | Update the RDC2.4 controller software to the latest version. |
| Main Power Overload Shutdown | An overcurrent condition on the DC power supply circuit | Check the crank, run, and flash relay circuits for short circuits. Refer to the wiring diagrams to identify the relay leads. Also see Section 6.13 for crank and run relay information. |
| Battery Low Warning or Battery CRLow Warning | Battery charging DC output from the controller | Check the battery charging DC output from the controller. Verify that AC power is connected to the field connection terminal block near the controller; verify that 120VAC is present across P5-1 and P5-3 in the harness; with P5 unplugged from the controller, check DC voltage across P1-1 and P1-2 or at the battery terminals, then reconnect P5 and verify that DC power starts to increase; check the battery and replace if necessary. |
| Generator set engine does not crank | Battery connections | Check for reversed or poor battery connections; Correct and tighten battery connections |
| Generator set engine does not crank | Weak or dead battery | Check the battery voltage. Test battery according to battery manufacturer's recommendations. Recharge or replace battery; Check battery charger connections and utility power connection to the generator set. Tighten connections. Connect 120VAC power to the genset terminal block |
| Generator set engine does not crank | Open circuit in engine/controller connections | Check for loose connections. Check the wire harness continuity. Tighten connections. Replace harness or harness leads if damaged |
| Generator set engine does not crank | Poor ground (-) connection | Test ground connection. Clean and retighten |
| Generator set engine does not crank | Starter relay | Check connections to the starter relay. Tighten connections. Replace wiring if damaged; Check continuity of circuit; Check that the starter relay picks up when 12 VDC is applied at lead 71 connection. Replace starter relay |
| Generator set engine does not crank | Starter | Check starter connections. Tighten connections. Replace wiring if damaged; Troubleshoot the starter. See the engine service manual for instructions. Rebuild or replace starter |
| Generator set engine does not crank | Controller | Check for 12 VDC to the controller. Check battery and connections; Check the genset model, engine model, and other controller settings. Adjust controller settings, if necessary; Troubleshoot the controller as described in Section 5.15. See Section 5.15 |
| Generator set engine does not crank | Emergency Stop circuit open | Check for Emerg Stop Shutdown on controller display. Check optional emergency stop button position and connections. Reset emergency stop button and reset controller fault. Check ESS and ESN connections. If not equipped with E-Stop button, verify that ESS and ESN are connected together |
| Cranks but does not start | No fuel | Verify that manual fuel valve is open. Check fuel supply tank (LP). Open (turn on) manual fuel valve. Contact fuel supplier to add fuel to fuel supply tank (LP) |
| Cranks but does not start | Insufficient fuel pressure | Check fuel pressure to the generator set. Verify adequate fuel pressure and pipe size for the generator set plus all other gas appliances. Contact fuel supplier to replace fuel supply lines with larger pipe and replace gas meter if fuel pressure is insufficient |
| Cranks but does not start | Fuel regulator/valve | Check regulator/valve operation. Check regulator/valve operation |
| Cranks but does not start | Weak battery | Check the battery voltage. Check battery charger connections and utility power connection to the generator set. Recharge or replace battery. Tighten loose connections |
| Cranks but does not start | Spark plugs or spark plug connections | Check spark plug wires and connections. Check spark plugs. Tighten connections. Replace spark plug wires if damaged. Replace or clean and regap spark plugs |
| Cranks but does not start | Loose connection or open circuit | Check for loose or open connection at the fuel valve (lead 70A) and at the engine spark control module (leads IGN and 70B). Check controller/engine wiring continuity. Tighten connections. Replace wiring if damaged |
| Cranks but does not start | Air cleaner clogged | Check for a dirty air cleaner element. Replace air cleaner element. Check and replace air cleaner element at the intervals shown in the Service Schedule |
| Cranks but does not start | Incorrect controller settings | Check the genset model setting. Enter the correct genset model number setting. Engine model is selected automatically based on genset model |
| Cranks but does not start | Ignition system spark control or ignition coil | Test according to instructions in the engine service manual. Adjust or replace components as indicated in engine service manual |
| Cranks but does not start | Ignition timing leads incorrectly connected or disconnected (14 kW only) | Check ignition timing leads. (14 kW only) Check for loose connections. Connect for natural gas. Disconnect for LP. Tighten connections. Replace wiring if damaged |
| Cranks but does not start | No engine rotation sensed (check for an overcrank or locked rotor fault shutdown) | Check the cranking circuit. Troubleshoot engine and alternator |
| Starts hard | Low battery voltage | Check battery voltage during cranking. Check battery charger connections and utility power connection to the generator set. Charge battery. Replace battery if necessary. Tighten loose connections |
| Starts hard | Air cleaner clogged | Check for a dirty air cleaner element. Replace element |
| Starts hard | Fuel mixture adjustment incorrect | Use oxygen sensor to check fuel mixture. Adjust fuel mixture |
| Starts hard | Ignition timing leads incorrectly connected or disconnected (14 kW only) | Check ignition timing connection. Connect for natural gas. Disconnect for LP. (14 kW only) |
| Starts hard | Spark plug(s) | Check spark plug condition and gap. Replace or regap spark plug(s) |
| Starts hard | Spark plug wire(s) | Check spark plug wires and connections. Tighten connections. Replace spark plug wires if damaged |
| Starts hard | Ignition components (spark control or ignition module) | Test ignition components according to instructions in the engine service manual. Replace ignition components if necessary |
| Starts hard | Insufficient fuel pressure | Check fuel pressure to the generator set. Verify adequate fuel pressure and pipe size for the generator set plus all other gas appliances. Contact fuel supplier to replace fuel supply lines with larger pipe and replace gas meter if fuel pressure is insufficient |
| Starts hard | Engine problem | Troubleshoot the engine. See engine service manual |
| Noisy operation | Exhaust system leaks | Check silencer and connections for leaks. Replace gaskets and exhaust system components as necessary |
| Noisy operation | Engine not running smoothly | See "Erratic operation," this table |
| Noisy operation | Broken or damaged vibromount(s) | Inspect vibromounts. Replace as necessary |
| Erratic operation | Air cleaner clogged | Check air filter element. Replace element |
| Erratic operation | Spark plug(s) | Check spark plug condition and gap. Replace or regap plugs |
| Erratic operation | Spark plug wire(s) | Check spark plug connections and wires. Tighten connections. Replace damaged spark plug wires |
| Erratic operation | DSAM leads incorrectly connected or disconnected (14 kW only) | Check DSAM/ignition timing lead connection. Connect for natural gas. Disconnect for LP. (14 kW only) |
| Erratic operation | Fuel line restriction | Check fuel lines. Check fuel pipe size. Clear restricted fuel lines. Contact fuel supplier to install larger diameter pipe |
| Erratic operation | Fuel mixture adjustment incorrect | Use oxygen sensor to check fuel mixture. Adjust fuel mixture |
| Erratic operation | Governor adjustment incorrect | Check governor operation. Check controller engine speed setting. Adjust governor. Adjust engine speed setting on controller |
| Erratic operation | Ignition system | Test ignition system according to instructions in engine service manual. Service ignition system according to instructions in engine service manual |
| Erratic operation | Inadequate cooling (hot engine only) | Check air inlet and outlet. Clear air inlet and outlet |
| Erratic operation | Other engine service required | See engine service manual. Service according to instructions in engine service manual |
| High output voltage | Incorrect controller settings | Check genset model, engine model, system voltage, and other controller settings. Adjust the controller settings |
| High output voltage | Incorrect voltage calibration | Check the voltage calibration. Adjust the voltage calibration |
| High output voltage | Loose voltage sensing connections | Check connections: stator leads 11 and 44 and P2 controller connection. Tighten connections |
| Lacks power | Air intake restriction, inadequate cooling | Inspect air intakes and exhaust for obstructions. Check air cleaner. Clear air intakes and exhaust area. Maintain clearances shown on the genset dimension drawing. Replace air cleaner element |
| Lacks power | Generator overloaded | Reduce electrical load and check operation. Unplug some lights or appliances connected to the generator set |
| Lacks power | Spark plug(s) | Check spark plugs. Regap or replace plug(s) |
| Lacks power | Spark plug connections | Check tightness and condition of spark plug wires. Tighten or replace spark plug wires |
| Lacks power | Ignition timing leads incorrectly connected or disconnected (14 kW only) | Check ignition timing leads. Connect for natural gas. Disconnect for LP. Connect for natural gas. Disconnect for LP. (14 kW only) |
| Lacks power | Low fuel pressure | Check fuel pressure at carburetor outlet. Check for adequate fuel pipe size and meter capacity for generator set and all gas-fired appliances. Contact fuel supplier to replace pipe and/or meter as required to provide sufficient fuel supply pressure for the generator set and all gas-fired appliances |
| Lacks power | Fuel line restriction | Check fuel pipe size. Contact fuel supplier to provide larger pipe |
| Lacks power | Fuel regulator | Check function of fuel regulator. Repair or replace fuel regulator |
| Lacks power | Engine not running at rated rpm | Check controller setting for engine model. Check engine speed. Select the correct engine model. Adjust engine speed |
| Lacks power | Engine power loss | Refer to the engine service manual for troubleshooting and repair instructions. Refer to the engine service manual for troubleshooting and repair instructions |
| Lacks power | Governor malfunction or misadjustment | Test governor. Adjust governor |
| Lacks power | Ignition system | See the engine service manual for service procedures. See the engine service manual for service procedures |
| Low output or excessive drop in voltage | Generator overloaded | Reduce electrical load and check operation. Unplug some lights or appliances connected to the generator set |
| Low output or excessive drop in voltage | Incorrect controller settings | Check the controller settings. Adjust the controller settings |
| Low output or excessive drop in voltage | Incorrect controller voltage settings | Check the controller voltage settings. Adjust the controller voltage settings |
| Low output or excessive drop in voltage | Alternator or control system | Perform separate excitation procedure to isolate problem to the alternator or the control system. Troubleshoot the alternator or control system as indicated by test results |
| Low output or excessive drop in voltage | Controller | Check the controller settings. Adjust controller settings; Test the controller as described in Section 5.15. See Section 5.15 |
| Low output or excessive drop in voltage | Rotor | Test rotor for open, grounded, or shorted windings. Replace rotor if faulty windings are found |
| Low output or excessive drop in voltage | Stator | Test stator for open, grounded, or shorted windings. Replace stator if faulty windings are found |
| Low output or excessive drop in voltage | Brush connection | Check for loose brush connections. Check for loose brush mounting. Check the resistance through the brushes. Resistance through the brushes should be low, 0.1- 0.2 ohms without meter lead resistance. Tighten loose brush connections. Tighten mounting screws. Replace brushes if they show uneven wear or are worn to one-half their original length |
| Low output or excessive drop in voltage | Low engine speed causing voltage roll-off | Check system voltage, system frequency, and engine model settings. Check engine speed setting. Engine problem. Change the controller settings if not correct. Adjust engine speed setting. Troubleshoot the engine |
| No output voltage | AC output circuit breaker open | Check for AC voltage on the generator side of circuit breaker. If there is AC voltage on the generator side of the breaker, then a problem in the load circuits is causing the line circuit breaker to trip. Check for and correct short circuits or overloading on the load side before resetting the circuit breaker |
| No output voltage | Alternator or control system | Perform separate excitation procedure to isolate the problem to the alternator or the control system. Troubleshoot the alternator or control system components as described below and elsewhere in this table |
| No output voltage | Controller | Check the controller settings. Adjust controller settings; Troubleshoot the controller as described in Section 5.15. See Section 5.15 |
| No output voltage | Open wiring, terminal, or pin in buildup circuit | Check wiring. Replace wiring as necessary |
| No output voltage | Brushes | Inspect brushes. Replace brushes if worn; Check for brushes sticking in brush holder or broken brush spring. Replace brush spring or brush assembly; Check that brush holder is securely mounted. Tighten brush holder screws |
| No output voltage | Rotor slip rings dirty or corroded | Check slip ring condition. Clean slip rings as described in Section 6.5. Machine slip rings if necessary |
| No output voltage | Rotor (open, grounded, or shorted windings) | Check voltage and continuity as described in Section 6.4. Repair or replace rotor if indicated by the tests |
| No output voltage | Stator (open, grounded, or shorted windings) | Check voltage and continuity as described in Section 6.3. Repair or replace the stator if indicated by the test results |
| No output voltage | Aux. winding circuit breaker tripped | Check the auxiliary winding breaker. If breaker trips again, check stator. Reset breaker. If breaker trips again, check stator |
| Controller LCD display is off | Display contrast set too low | Use controller keypad or SiteTech to adjust contrast |
| Controller LCD display is off | Low or no battery voltage | Check controller connections. Check DC power to the RDC2 controller. Check generator set battery connections and condition. Check utility power connection to the generator set terminal block (power for battery charging) |
| Loss of communication to accessory modules | Bad connections | Check wiring and connections. Verify that cable size and length of run comply with the instructions in the Installation manual |
| Loss of communication to accessory modules | Low or no battery voltage | Check generator set battery connections and condition. See "Low or no battery voltage" above |
| Load management relays do not operate (if equipped) | Bad connections | Check wiring and connections. Verify that cable size and length of run comply with specifications |
| Load management relays do not operate (if equipped) | Low or no battery voltage | Check generator set battery connections and condition. See "Low or no battery voltage" above |
| Date is flashing | Controller power was disconnected and then reconnected | Check battery connections. Check controller connections. Check utility power connection to the generator set terminal block. Reset the time, date, and exercise schedule |
| Load shed AC relays do not activate | Verify 120 VAC supply voltage to relays; Verify correct wiring to the load management device board and AC relays | |
| Metering always reads 0% under load | Verify that the Emergency feed to the ATS goes through the CT correctly; Verify that the CT leads are connected to the load management device input correctly; Verify that the correct CT is used. (400 A to 3V) | |
| Metering never reads 0% | Verify that the CT is wired correctly; Verify that twisted-pair cable was used; Verify that CT wiring is in separate conduit from AC leads | |
| Load A does not add after initial shed | Verify that the correct size wires are used for PWR and COM connections from the generator set controller to the load management device. See the installation instructions for the load management device. | |
| Load management does not shed enough load for the generator to recover — HVAC units do not shed | Verify normally closed (NC) output is used to control HVAC | |
| Load management does not shed enough load for the generator to recover — Does not shed when load is between 85% and 90% | Verify that the load is not intermittently dropping below 85%; Verify that the load remains above 90% for at least 40 seconds; Verify that the % load is metering correctly; Verify that the overload percent is set at 10% or more below indicated level; Verify that the load management device is communic | |
| Generator set stops suddenly | Model 20RCA/20RCAL only: enclosure thermostat tripped | Check enclosure thermostat and reset if tripped; Check and clear air inlets and exhaust outlets |
| Generator set stops suddenly | Remote stop command received from a remote switch, ATS, or OnCue Plus | Check the remote switch position; Check OnCue Plus |
| Generator set stops suddenly | Remote stop command received from a remote switch, ATS, or OnCuePlus | Check the remote switch position; Check OnCuePlus |
| Generator shuts down and controller displays a fault (underspeed, underfrequency, or undervoltage) | Generator thermostat tripped due to excess heat inside the enclosure | Check for blocked air inlets and exhaust outlets; Reset the thermostat; Reset the fault on the controller |
| Generator shuts down with a fault (underspeed, underfrequency, or undervoltage) | Thermostat detects excess heat inside the enclosure; blocked air inlets and exhaust outlets | Check for blocked air inlets and exhaust outlets; Reset the thermostat |
| Generator shuts down with fault (underspeed, underfrequency, or undervoltage) | Thermostat detects excess heat inside the enclosure; thermostat tripped | Check for blocked air inlets and exhaust outlets; Reset the thermostat |
| Generator will shut down and the controller will display a fault (underspeed, underfrequency, or undervoltage) | Generator thermostat tripped (excess heat inside the enclosure) | Check for blocked air inlets and exhaust outlets. Then reset the thermostat: disconnect the utility power to the generator by opening (turning OFF) the corresponding circuit breaker at the building’s distribution panel; open the enclosure roof and secure it with the roof stay on the left side of the enclosure; remove the air intake panel; press the button on the thermostat to reset it; replace the air intake panel; reconnect utility power to the generator set by closing the circuit breaker in the distribution panel; reset the fault on the controller |
| System shuts down on an overcrank fault | Generator set does not start in three attempts |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Low oil pressure shutdown; No fuel; Overcrank shutdown; Auxiliary winding circuit breaker tripped. See the table for the matching fixes.
Documented causes: Controller firmware not the latest version; Engine Speed Gain Adjustment setting not correct; Dirty air cleaner filter element; Air intake tube not seated properly on the filter housing or grommet not completely inserted in the housing. See the table for the matching fixes.
Documented causes: Air intake restriction, inadequate cooling; Generator overloaded; Spark plug(s); Spark plug connections. See the table for the matching fixes.