Cummins/Onan DFAC troubleshooting: 106 fault codes and 9 symptom-cause-remedy entries from the manufacturer's own service documentation.
Cummins/Onan DFAC — full specs, parts & maintenance.
All Cummins/Onan fault codes →
| Code | Meaning | Cause | Remedy |
|---|---|---|---|
| 101 | IDLE MODE — WARNING; Engine continues to operate at reduced RPM. | Indicates that the engine is operating in idle mode. When the set is operating in the RUN mode, grounding the engine idle input causes generator build-up to be inhibited and the engine to be governed at 800 RPM. | When ground is removed from this input, the set returns to normal speed and voltage. When the engine idle function is enabled, the control automatically sets lower oil pressure warning and shutdown trip points to reflect the lower operating speed. When the engine idle function is removed and the set reverts to normal operating speed, the control automatically resets oil pressure warning and shutdown trip points to the normal settings. |
| 102 | EMERGENCY STOP — SHUTDOWN; Engine shuts down and will not crank. | Indicates local or remote Emergency Stop. | To reset the local Emergency Stop button: Pull the button out or turn the switch clockwise (button with arrow) and allow it to pop out; Move the Run/Off/Auto switch to Off; Press the Reset switch; Select Run or Auto, as required. |
| 200 | LOW OIL PRESSURE — WARNING | Indicates engine oil pressure has dropped to an unacceptable level. | If generator is powering critical loads and cannot be shut down, wait until next shutdown period then follow 201 Low Oil Pressure procedure. If engine can be stopped, follow 201 procedure. To check oil pressure, access Oil Pressure menu prior to clearing the fault. |
| 201 | LOW OIL PRESSURE — SHUTDOWN | Indicates engine oil pressure has dropped below the shutdown trip point. | Check oil level, lines and filters. If oil system is OK but oil level is low, replenish. Reset control and restart. Oil pressure limits are listed in Specifications. Contact an authorized service center. |
| 204 | OIL PRESS SENDER — WARNING | Indicates that the engine oil pressure sender is not functioning correctly. | Check that the engine oil pressure sender is properly connected. Contact an authorized service center. |
| 210 | LOW COOLANT TEMP — WARNING; Set is in standby mode but is not operating. Warning occurs when engine coolant temperature is 70 F (21 C) or lower. NOTE: In applications where the ambient temperature falls below 40 F (4 C), Low Engine Temp may be indicated even though the coolant heaters are operating. | Indicates engine coolant heater is not operating or is not circulating coolant. | Coolant heater not connected to power supply. Check for blown fuse or disconnected heater cord and correct as required; Check for low coolant level and replenish if required. Look for possible coolant leakage points and repair as required; Contact an authorized service center if none of the above. |
| 211 | HIGH COOLANT TEMP — WARNING | Indicates engine has begun to overheat and coolant temperature has risen to an unacceptable level: (215 F − standby / 207 F − primary). | If generator is powering non-critical and critical loads and cannot be shut down, use the following: Reduce load if possible by turning off non-critical loads; Check air inlets and outlets and remove any obstructions to airflow. If engine can be stopped, follow the next procedure. To check coolant temperature, access Coolant Temp menu prior to clearing the fault. |
| 212 | HIGH COOLANT TEMP — SHUTDOWN | Indicates engine has overheated (coolant temperature has risen above the shutdown trip point: 223 F − standby / 215 F − primary) or the coolant level is low. | Allow engine to cool down completely before proceeding with the following checks: Check coolant level and replenish if low. Look for coolant leakage and repair if necessary; Check for obstructions to cooling airflow and correct as necessary; Check fan belt and repair or tighten if necessary; Reset control and restart after locating and correcting problem. Contact an authorized service center if none of the above. |
| 213 | ENG COOLANT SENDER — WARNING | Indicates that the resistance of the coolant temperature sender is out of range. | Contact an authorized service center. |
| 214 | LOW COOLANT LVL — WARNING | Indicates engine coolant level has fallen below the trip point. | Allow engine to cool down completely before proceeding. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary; Reset control and restart after locating and correcting problem. Contact an authorized service center. |
| 215 | LOW COOLANT LVL — SHUTDOWN; LOW COOLANT LVL Shutdown will not occur if generator set is in Idle mode (low coolant warning only). | Indicates engine coolant level has fallen below the trip point. | Allow engine to cool down completely before proceeding. Check coolant level and replenish if low. Look for possible coolant leakage points and repair if necessary; Reset control and restart after locating and correcting problem. Contact an authorized service center. |
| 220 | MAG PICKUP — SHUTDOWN | Indicates mag pickup speed indication is not being sensed or does not match generator set output frequency. | Restart and check RPM on the digital display; Contact an authorized service center. |
| 221 | FAIL TO CRANK — SHUTDOWN; Engine will not crank. | Indicates possible fault with control or starting system. | Poor battery cable connections. Clean the battery cable terminals and tighten all connections; Discharged or defective battery. Recharge or replace the battery; Contact an authorized service center for service of starter and starting system. |
| 222 | OVERCRANK — SHUTDOWN; Engine stops cranking. | Indicates possible fuel system problem. | Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required; Check for dirty fuel filter and replace if necessary; Check for dirty or plugged air filter and replace if necessary; Reset the control and restart after correcting the problem. Contact an authorized service center if none of the above. |
| 223 | OVERSPEED — SHUTDOWN; Engine runs and then shuts down. | Indicates engine has exceeded normal operating speed. (2070 rpm @ 60 hz; 1800 rpm @ 50 hz) | Contact an authorized service center. |
| 230 | LOW DC VOLTAGE — WARNING | Indicates battery voltage is below 24 VDC. | Discharged or defective battery. Check the battery charger fuse. Recharge or replace the battery; Poor battery cable connections. Clean the battery cable terminals and tighten all connections; Contact an authorized service center if none of the above. |
| 231 | HIGH DC VOLTAGE — WARNING | Indicates battery voltage exceeds 32 VDC. | Contact an authorized service center. |
| 232 | WEAK BATTERY — WARNING | Indicates battery voltage drops below 60% of nominal for two seconds, during starting. Discharged or defective battery. | See Warning message 230, LOW DC VOLTAGE. |
| 240 | LOW FUEL DAY — WARNING | Indicates day tank fuel supply is running low. | Check fuel supply and replenish as required. |
| 241 | LOW FUEL — WARNING | Indicates fuel supply is running low. | Check fuel supply and replenish as required. |
| 250 | EEPROM ERROR — SHUTDOWN | Indicates PCC memory error. Data corruption of critical operating parameters. | Contact an authorized service center. |
| 251 | EEPROM ERROR — WARNING | Indicates PCC memory error. Data corruption of noncritical operating parameters. | Contact an authorized service center. |
| 252 | EEPROM ERROR — WARNING | Indicates PCC memory error. Data corruption of noncritical operating parameters. | Contact an authorized service center. |
| 260 | CUSTOMER FAULT 1 — SHUTDOWN | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Shutdown lamp, a shutdown response has been preselected. | Contact an authorized service center. |
| 261 | GROUND FAULT — SHUTDOWN | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Shutdown lamp, a shutdown response has been preselected. | Contact an authorized service center. |
| 262 | RUPTURE BASIN — SHUTDOWN | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Shutdown lamp, a shutdown response has been preselected. | Contact an authorized service center. |
| 263 | HIGH GEN TEMP — SHUTDOWN | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Shutdown lamp, a shutdown response has been preselected. | Contact an authorized service center. |
| 260 | CUSTOMER FAULT 1 — WARNING | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Warning lamp, a warning response has been preselected. | |
| 261 | GROUND FAULT — WARNING | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Warning lamp, a warning response has been preselected. | |
| 262 | RUPTURE BASIN — WARNING | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Warning lamp, a warning response has been preselected. | |
| 263 | HIGH GEN TEMP — WARNING | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Warning lamp, a warning response has been preselected. | |
| 301 | HIGH AC VOLTAGE — SHUTDOWN | Indicates that one or more of the phase voltages has exceeded 130% of nominal, or has exceeded 110% of nominal for 10 seconds. | Contact an authorized service center. |
| 303 | LOW AC VOLTAGE — SHUTDOWN | Indicates that one or more of the phase voltages has dropped below 85% of nominal for 10 seconds. | Contact an authorized service center. |
| 313 | UNDER FREQUENCY — SHUTDOWN | Indicates that engine speed has dropped below 90% of nominal for 10 seconds. NOTE: Five seconds before shutdown, a Load Dump signal is initiated. | Contact an authorized service center. |
| 320 | OVERCURRENT — WARNING | Indicates that generator output current has exceeded 110% of rated for 60 seconds. | Contact an authorized service center. |
| 321 | OVERCURRENT — SHUTDOWN | Indicates that generator output current has exceeded 110% of rated, and that a PCC time/current calculation has initiated an overcurrent shutdown. | Contact an authorized service center. |
| 322 | SHORT CIRCUIT — SHUTDOWN | Indicates that generator output current has exceeded 175% of rated. | Contact an authorized service center. |
| 330 | OVERLOAD — WARNING | Indicates that three-phase power output exceeds 105% of standby (or 115% of prime) rating. After five seconds, the Load Dump output is activated. After 60 seconds, the OVERLOAD warning is activated. | Contact an authorized service center. |
| 335 | REVERSE POWER — SHUTDOWN | Indicates improper CT or PT phasing. (Non-parallel units only.) | Contact an authorized service center. |
| 221 | Shutdown lamp lights. Engine will not crank. | Indicates possible fault with control or starting system. Check for the following conditions: a. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. b. Discharged or defective battery. Recharge or replace the battery. c. Contact an authorized service center for service of starter and start- ing system. | |
| 222 | Shutdown lamp lights. Engine stops cranking. | A. Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. b. Check for dirty fuel filter and replace if necessary. c. Check for dirty or plugged air filter and replace if necessary. d. Reset the control and restart after correcting the problem. Contact an authorized service center if none of the above. | |
| 223 | Shutdown lamp lights. Engine runs and then shuts down. | Indicates engine has exceeded normal operating speed. (2070 rpm @ 60 hz; 1800 rpm @ 50 hz) Contact an authorized service center. | |
| 230 | Warning lamp lights. MESSAGE: LOW DC VOLTAGE | A. Discharged or defective battery. Check the battery charger fuse. Recharge or replace the battery. b. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. c. Contact an authorized service center if none of the above. | |
| 231 | Warning lamp lights. MESSAGE: HIGH DC VOLTAGE | Contact an authorized service center. | |
| 232 | Warning lamp lights. MESSAGE: WEAK BATTERY | Discharged or defective battery. See Warning message 230, LOW DC VOLTAGE. | |
| 240 | Warning lamp lights. MESSAGE: LOW FUEL DAY | Check fuel supply and replenish as required. | |
| 241 | Warning lamp lights. MESSAGE: LOW FUEL | Check fuel supply and replenish as required. | |
| 250 | Shutdown lamp lights. MESSAGE: EEPROM ERROR | Indicates PCC memory error. Data corruption of critical operating parameters. Contact an authorized service center. | |
| 301 | Shutdown lamp lights. MESSAGE: HIGH AC VOLTAGE | Indicates that one or more of the phase voltages has exceeded 130% of nominal, or has exceeded 110% of nominal for 10 seconds. Contact an authorized service center. | |
| 303 | Shutdown lamp lights. MESSAGE: LOW AC VOLTAGE | Indicates that one or more of the phase voltages has dropped below 85% of nominal for 10 seconds. Contact an authorized service center. | |
| 313 | Shutdown lamp lights. MESSAGE: UNDER FREQUENCY | Indicates that engine speed has dropped below 90% of nominal for 10 seconds. NOTE: Five seconds before shutdown, a Load Dump signal is initiated. Contact an authorized service center. | |
| 320 | Warning lamp lights. MESSAGE: OVERCURRENT | Indicates that generator output current has exceeded 110% of rated for 60 seconds. Contact an authorized service center. | |
| 321 | Shutdown lamp lights. MESSAGE: OVERCURRENT | Indicates that generator output current has exceeded 110% of rated, and that a PCC time/current calculation has initiated an overcurrent shutdown. Contact an authorized service center. | |
| 121 | Speed Signal Lost | ||
| 135 | Oil Pressure Sensor High | ||
| 141 | Oil Pressure Sensor Low | ||
| 143 | Pre-Low Oil Pressure Sensor | ||
| 144 | Coolant Temperature Sensor High | ||
| 145 | Coolant Temperature Sensor Low | ||
| 146 | Pre-High Cool Temp | ||
| 151 | High Coolant Temp | ||
| 197 | Low Coolant Level | ||
| 234 | Overspeed | ||
| 235 | Low Coolant Level | ||
| 359 | Fail to Start | ||
| 415 | Low Oil Pressure | ||
| 441 | Low Battery Voltage | ||
| 442 | High Battery Voltage | ||
| 1123 | Shutdown After Battle Short | ||
| 1124 | Delayed Shutdown | ||
| 1131 | Battle Short Active | ||
| 1244 | Engine Normal Shutdown | ||
| 1311 | Customer Inputs #1 | ||
| 1312 | Customer Inputs #2 | ||
| 1317 | Customer Inputs #3 | ||
| 1318 | Customer Inputs #4 | ||
| 1334 | Crit Scaler OR | ||
| 1335 | Non-Crit Scaler OR | ||
| 1416 | Fail to Shutdown | ||
| 1417 | Power Down Failure | ||
| 1433 | Emergency Stop | ||
| 1434 | Remote Emergency Stop | ||
| 1435 | Low Coolant Temperature | ||
| 1438 | Fail to Crank | ||
| 1442 | Weak Battery | ||
| 1443 | Battery Failed | ||
| 1444 | KW Overload | ||
| 1445 | Short Circuit | ||
| 1446 | High AC Voltage | ||
| 1447 | Low AC Voltage | ||
| 1448 | Under Frequency | ||
| 1449 | Over Frequency | ||
| 1461 | Loss of Field | ||
| 1466 | Modem Failure | ||
| 1468 | Network Error | ||
| 1469 | Speed/Hz Match | ||
| 1471 | Over Current | ||
| 1472 | Over Current | ||
| 2335 | Excitation Fault | ||
| 2336 | Memory Error | ||
| 2341 | High Control Temperature | ||
| 2342 | Too Long in Idle | ||
| 2967 | Governor Fault | ||
| 2968 | AVR Fault | ||
| 2969 | LON Failure | ||
| 2972 | Field Overload |
| Symptom | Cause | Remedy |
|---|---|---|
| Control does not power up when the Run/Off/Auto switch is set to Run or the Self Test switch is pressed. | There is no DC power to the control. | Check for battery disconnected, discharged, or improperly connected; Fuse F1 (20A/32V, Type 3AG) may be open. Replace with the same type. (Fuse is mounted near engine starter/solenoid, see Figure 4-2); Contact an authorized service center. |
| Warning, Shutdown, and Non-Automatic lamps are not lit. Digital display shows main menu or selected menu. | Indicates all engine systems are normal. | No corrective action required. |
| Non-Automatic lamp flashes. | Indicates Run/Off/Auto switch is not in the Auto position. This will prevent automatic starting if an automatic transfer switch is used. | Move the Run/Off/Auto switch to the Auto position for automatic operation. |
| Engine starts from generator control panel but will not start automatically or from a remote panel. (Note: The Run/Off/Auto switch must be in the Auto position for automatic or remote starting). | Control wiring between the remote switch and the PCC. | Check the control wiring between the remote switch and the PCC; Contact an authorized service center. |
| No AC output voltage. | Contact an authorized service center. | |
| Warning lamp lights. MESSAGE: EEPROM ERROR | Indicates PCC memory error. Data corruption of noncritical operating parameters. Contact an authorized service center. | |
| Shutdown lamp lights. MESSAGE: CUSTOMER FAULT 1 or GROUND FAULT or RUPTURE BASIN or HIGH GEN TEMP | When any one of these customer defined inputs is closed to ground, the corresponding fault message is displayed. The nature of the fault is an optional customer selection. These fault functions can be programmed to initiate a shutdown or a warning. As indicated by the Shutdown lamp, a shutdown response has been preselected. Contact an authorized service center. | |
| Excessive Axial alignment will cause more generator vibration than Angular misalignment. | Axial misalignment is the result of the generator shaft axis not aligning with engine crankshaft axis. The tolerances in the bolted flywheel and drive disc connection may add up to displace the generator axially relative to the crankshaft axis. | |
| If the assembly is allowed to run under these conditions, the discs must flex in alternate directions twice for each engine revolution. It is important to minimize the amount of disc flexing since, if it is excessive, the drive disc will crack. | Angular misalignment is the result of the generator bearing center axis not aligning with axis of the engine crankshaft. This condition creates an angle between the generator shaft axis and the crankshaft axis. The cause of this type of misalignment is usually shimming error. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing.
Documented causes: Indicates PCC memory error. Data corruption of noncritical operating parameters.. See the table for the matching fixes.
Documented causes: There is no DC power to the control.. See the table for the matching fixes.
Documented causes: Indicates all engine systems are normal.. See the table for the matching fixes.