100 Katolight generator fault/alarm codes with symptom, cause and remedy — compiled from Katolight service and controller documentation.
| Code | Meaning / symptom | Cause | Remedy |
|---|---|---|---|
| 1 | PRE HI ENGINE TEMP. Engine continues to operate. | Engine has begun to overheat and engine temperature has risen to approximately 215°F (102°C). | Reduce load if possible by turning off non-critical loads; Check air inlets and outlets and remove any obstructions to airflow; Open doors or windows in generator area to increase ventilation; If engine can be stopped, follow procedure in Step 2. |
| 1 | Unused / open | ||
| 2 | HI ENGINE TEMP LED. Engine shuts down. | Engine has overheated (engine temperature has risen above 225°F/107°C) or coolant level is low (sets with coolant level sensor). | 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; Check for obstructions to cooling airflow and correct as necessary; Check for a slipping fan belt and tighten if loose; Reset control and restart after locating and correcting problem. Contact your Dealer or Distributor if none of the above. |
| 2 | Generator failed to start | See Problems C and D | |
| 3 | PRE LOW OIL PRESSURE. Engine continues to operate. | Engine oil pressure has dropped to 20 psi (138kPa). | If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow Step 4 procedure. If engine can be stopped, follow procedures in Step 4. |
| 3 | Generator failed after starting | See Generator Troubleshooting Section | |
| 4 | LOW OIL PRESSURE. Engine shuts down. | Engine oil pressure has dropped to 15 psi (103kPa). | Check oil level, lines and filters. If oil system is okay, but oil level is low, replenish. Reset control and restart. Contact your Dealer or Distributor if oil pressure is not in the range of 35 to 55 psi (241 to 379 kPa). |
| 4 | Generator over or under frequency | See Generator Troubleshooting Section | |
| 5 | OVERCRANK. Engine stops cranking. Or Engine runs, shuts down, and LOW OIL PRESSURE. | 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 (See Maintenance section of Engine Manual); Check for dirty or plugged air filter and replace if necessary (See Maintenance section of Engine Manual); Refer to Step 4; Reset the control and restart after correcting the problem. Contact your Dealer or Distributor for service if none of the above. |
| 5 | Transfer Switch did not transfer the load to the generator | Service required | |
| 6 | OVERSPEED. Engine runs and then shuts down. | Engine has exceeded normal operating speed. | Refer to governor adjust procedure. Contact your Dealer or Distributor for service. |
| 6 | Transfer Switch did not transfer the load to the utility | Service required | |
| 7 | UNIT NOT IN AUTO. | AUTO/OFF/RUN switch is in the OFF position which will prevent automatic starting if an automatic transfer switch is used. | Move the AUTO/OFF/RUN switch to the AUTO position for automatic starting. |
| 7 | Controller error | Service required | |
| 8 | LOW FUEL. Engine continues to run. | Diesel fuel supply is running low. | Check fuel supply and replenish as required. |
| 9 | LOW FUEL and LOW OIL. | Engine has run out of fuel. | Check fuel level and replenish as required. See Engine Manual for fuel system priming procedure. |
| 9 | High Engine Temp Pre-alarm LED | ||
| 10 | LOW ENGINE TEMPERATURE. Set is in standby mode but not operating. | Engine coolant heater is not operating or is not circulating coolant. | Check for the following conditions: Coolant heater not connected to power supply. Check for blown fuse, open circuit. |
| 10 | Low Oil Pressure Pre-alarm LED | ||
| 11 | Low Fuel LED | Check fuel supply and replenish as required. | |
| 12 | Unit Not In Auto LED | Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting. | |
| 13 | FAULT LED on but no fault exists. Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits — The monitor board or a sensor may be at fault. | Contact your Dealer or Distributor for service | |
| 14 | Engine starts from generator control panel, but will not start automatically or from a remote panel. (Note: The AUTO/OFF/MANUAL switch must be in the AUTO position for automatic or remote starting) — Indicates possible fault with remote start circuit. | Check the following: Check wire to ATS; See ATS section for further troubleshooting; Contact your Dealer or Distributor for assistance | |
| 15 | Engine will not crank — Indicates possible fault with control or starting system. | Check for the following conditions: Fault lamp on. Correct fault and reset control; Poor battery cable connections. Clean the battery cable terminals and tighten all connections; Discharged or defective battery. Recharge or replace the battery; Contact your Dealer or Distributor for assistance if none of the above | |
| 16 | No AC output voltage — Indicates possible fault | ||
| 17 | Overcrank LED | Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. Check for dirty fuel filter and replace if necessary (See Maintenance section of Engine Manual). Check for dirty or plugged air filter and replace if necessary (See Maintenance section of Engine Manual). | |
| 18 | Engine Over-speed LED | Refer to governor adjust procedure. Contact your Dealer or Distributor for service. | |
| 19 | Unit Not In Auto LED | Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting. | |
| 20 | Low Fuel LED | Check fuel level and replenish as required. See Engine Manual for fuel system priming procedure. | |
| 21 | Low Coolant Temperature LED | Check for the following conditions: Coolant heater not connected to power supply. Check for blown fuse, open circuit breaker 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. | |
| 22 | Charger Malfunction LED | Check and repair. Contact Dealer or Distributor for assistance. | |
| 23 | Low Battery LED | Check electrolyte level and charger output or replace the battery. | |
| 24 | Fault LED on but no fault exists. Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits. | Contact your Dealer or Distributor for service. | |
| 25 | Engine Start from Generator Control Panel but will not start automatically or from a remote panel. | Check the following: Check wire to ATS. See ATS section for further troubleshooting. Contact your Dealer or Distributor for assistance. | |
| 26 | Engine will not crank. | Check for the following conditions: Fault lamp on. Correct fault and reset control. Poor battery cable connections. Clean the battery cable terminals and tighten all connections. Discharged or defective battery. Recharge or replace the battery. | |
| 27 | No AC Output Voltage. | Verify output with another meter if ok check meter, if ok check meter fuses. Regulator fuse is blown. Replace fuse. Contact your Dealer or Distributor if voltage build-up causes fuse to blow. Check rotating rectifier for damaged diodes. Replace all diodes if any are failed. | |
| 28 | No Engine Start. | Check Engine Start connections. Investigate why the Engine Control Switch was put in Manual. Contact your Dealer or Distributor for assistance. | |
| 29 | No Engine Stop. | Check Engine Start Timer setting. Check Engine Start Connections. Investigate why the Engine Control Switch was put in Manual. Contact your Dealer or Distributor for assistance. | |
| 30 | ATS will not transfer to Emergency. | Check Engine Start connections, Generator output, and Engine Control Switch. Plug in Power Supply harness. Plug in Limit Switch harness. Check transfer to Emergency Timer setting. Contact your Dealer or Distributor for assistance. | |
| 31 | ATS will not transfer to Normal. | Check Utility and Utility breakers. Plug in Power Supply harness. Plug in Limit Switch harness. Check retransfer to Normal Timer setting. Contact your Dealer or Distributor for assistance. | |
| #14 | PRE-HI ENGINE TEMP LED. Engine continues to operate — Indicates engine has begun to overheat and engine temperature has risen to approximately 215°F (105°C). 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; Open doors or windows in generator area to increase ventilation; If engine can be stopped, follow procedure in Step 2 | |
| *3 | PRE LOW OIL PRESSURE LED. Engine continues to operate — Indicates engine oil pressure has dropped to 20 psi (138kPa). If generator is powering critical loads and cannot be shut down, wait until next shutdown period and then follow Step 4 procedure. If engine can be stopped, follow procedures in Step 4. | ||
| *7 | UNIT NOT IN AUTO LED — Indicates AUTO/OFF/MANUAL switch is in the OFF position which will prevent automatic starting if an automatic transfer switch is used. | Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting | |
| *9 | LOW FUEL LED. Engine shuts down and LOW OIL PRESSURE LED — Indicates engine has run out of fuel. | Check fuel level and replenish as required. See Engine Manual for fuel system priming procedure | |
| *10 | LOW ENGINE TEMPERATURE LED. Set is in standby mode but not operating — Indicates engine coolant heater is not operating or is not circulating coolant. | Check for the following conditions: Coolant heater not connected to power supply. Check for blown fuse, open circuit breaker 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 your Dealer or Distributor if none of the above | |
| *11 | CHARGER MALFUNCTION LED. Unit continues to run — Indicates possible fault with the battery charging system. If LED is on only when unit is running indicated problem with battery charging alternator. | Check and repair. Contact Dealer or Distributor for assistance | |
| *12 | LOW BATTERY LED — Indicates starting battery voltage is low. | Check electrolyte level and charger output or replace the battery | |
| SPN 100 FMI 03 | Throttle # 3 Input High | ||
| SPN 100 FMI 04 | Throttle # 3 Input Low | ||
| SPN 102 FMI 03 | Throttle # 2 Input High | ||
| SPN 102 FMI 04 | Throttle # 2 Input Low | ||
| SPN 105 FMI 03 | Throttle # 1 Input High | ||
| SPN 105 FMI 04 | Throttle # 1 Input Low | ||
| SPN 105 FMI 08 | Throttle # 1 Abnormal Pulse Width | ||
| SPN 105 FMI 09 | Throttle # 1 CAN Invalid | ||
| SPN 107 FMI 01 | Fuel Supply Pressure Extremely Low | ||
| SPN 107 FMI 03 | Fuel Supply Pressure Input Voltage High | ||
| SPN 107 FMI 04 | Fuel Supply Pressure Input Voltage Low | ||
| SPN 107 FMI 16 | Fuel Supply Pressure Moderately High | ||
| SPN 107 FMI 18 | Fuel Supply Pressure Moderately Low | ||
| SPN 110 FMI 03 | Water in Fuel Signal Voltage Low | ||
| SPN 110 FMI 04 | Water in Fuel Detected | ||
| SPN 110 FMI 16 | Water in Fuel Detected | ||
| SPN 111 FMI 31 | Engine Oil Pressure Extremely Low | ||
| SPN 158 FMI 01 | Engine Oil Pressure Input Voltage High | ||
| SPN 174 FMI 03 | Engine Oil Pressure Input Voltage Low | ||
| SPN 174 FMI 04 | Engine Oil Pressure Moderately Low | ||
| SPN 410 FMI 03 | Water in Fuel Continuously Detected | ||
| SPN 410 FMI 04 | Water in Fuel Signal Voltage High | ||
| SPN 611 FMI 03 | Manifold Air Pressure Input Voltage Low | ||
| SPN 611 FMI 18 | Manifold Air Pressure Input Voltage High | ||
| SPN 620 FMI 00 | Air Filter Restriction High | ||
| SPN 620 FMI 00 | Engine Coolant Temperature Extremely High | ||
| SPN 620 FMI 01 | Engine Coolant Level Low | ||
| SPN 620 FMI 03 | Manifold Air Temperature Input Voltage High | ||
| SPN 620 FMI 03 | Injector Wiring Shorted to Power Source | ||
| SPN 620 FMI 04 | Manifold Air Temperature Input Voltage Low | ||
| SPN 620 FMI 04 | Injector Wiring Shorted to Ground | ||
| SPN 620 FMI 15 | Engine Coolant Temperature High (Least Severe) | ||
| SPN 620 FMI 16 | Manifold Air Temperature Moderately High | ||
| SPN 620 FMI 16 | Engine Coolant Temperature Moderately High | ||
| SPN 620 FMI 17 | ECU Power Down Error | ||
| SPN 620 FMI 31 | Air Filter Restriction High | ||
| SPN 627 FMI 01 | Injector Supply Voltage Problem | ||
| SPN 629 FMI 12 | ECU Error | ||
| SPN 629 FMI 13 | ECU Error | ||
| SPN 636 FMI 02 | Cam Position Input Noise | ||
| SPN 636 FMI 08 | Cam Position Input Missing | ||
| SPN 636 FMI 10 | Cam Position Input Pattern Error | ||
| SPN 637 FMI 02 | Crank Position Input Noise | ||
| SPN 637 FMI 07 | Crank Position/Cam Position Out of Sync | ||
| SPN 637 FMI 08 | Crank Position Input Missing | ||
| SPN 637 FMI 10 | Crank Position Input Pattern Error | ||
| SPN 639 FMI 13 | CAN (Network) Error | ||
| SPN 651 FMI 05 | Cylinder # 1 EUI Circuit Open | ||
| SPN 651 FMI 06 | Cylinder # 1 EUI Circuit Shorted | ||
| SPN 652 FMI 05 | Cylinder # 2 EUI Circuit Open | ||
| SPN 652 FMI 06 | Cylinder # 2 EUI Circuit Shorted | ||
| SPN 653 FMI 05 | Cylinder # 3 EUI Circuit Open | ||
| SPN 653 FMI 06 | Cylinder # 3 EUI Circuit Shorted | ||
| SPN 654 FMI 05 | Cylinder # 4 EUI Circuit Open | ||
| SPN 654 FMI 06 | Cylinder # 4 EUI Circuit Shorted | ||
| SPN 655 FMI 05 | Cylinder # 5 EUI Circuit Open | ||
| SPN 655 FMI 06 | Cylinder # 5 EUI Circuit Shorted | ||
| SPN 656 FMI 05 | Cylinder # 6 EUI Circuit Open | ||
| SPN 656 FMI 06 | Cylinder # 6 EUI Circuit Shorted | ||
| SPN 970 FMI 02 | Auxiliary Engine Shutdown Switch Signal Invalid | ||
| SPN 970 FMI 31 | Auxiliary Engine Shutdown Switch Active | ||
| SPN 971 FMI 31 | External Fuel Derate Switch Active | ||
| SPN 1109 FMI 31 | Engine Shutdown Warning | ||
| SPN 1110 FMI 31 | Engine Shutdown | ||
| SPN 1569 FMI 31 | Fuel Derate | ||
| SPN 2000 FMI 13 | Security Violation |
Compiled from Katolight service manuals and controller documentation. 13 code numbers mean different things on different controllers; each meaning is listed with the models it applies to. Cause/remedy shown where extracted; always verify against the manual for your exact model.
LOW FUEL. Engine continues to run.. Cause: Diesel fuel supply is running low.. Remedy: Check fuel supply and replenish as required..
Low Fuel LED. Remedy: Check fuel supply and replenish as required..
Unit Not In Auto LED. Remedy: Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting..
FAULT LED on but no fault exists. Engine gauges show oil pressure, engine temperature, and frequency (speed) are within normal limits — The monitor board or a sensor may be at fault.. Remedy: Contact your Dealer or Distributor for service.
Engine starts from generator control panel, but will not start automatically or from a remote panel. (Note: The AUTO/OFF/MANUAL switch must be in the AUTO position for automatic or remote starting) — Indicates possible fault with remote start circuit.. Remedy: Check the following: Check wire to ATS; See ATS section for further troubleshooting; Contact your Dealer or Distributor for assistance.
Engine will not crank — Indicates possible fault with control or starting system.. Remedy: Check for the following conditions: Fault lamp on. Correct fault and reset control; Poor battery cable connections. Clean the battery cable terminals and tighten all connections; Discharged or defective battery. Recharge or replace the battery; Contact your Dealer or Distributor for assistance if none of the above.
Overcrank LED. Remedy: Check for empty fuel tank, fuel leaks, or plugged fuel lines and correct as required. Check for dirty fuel filter and replace if necessary (See Maintenance section of Engine Manual). Check for dirty or plugged air filter and replace if necessary (See Maintenance section of Engine Manual)..
Engine Over-speed LED. Remedy: Refer to governor adjust procedure. Contact your Dealer or Distributor for service..
Unit Not In Auto LED. Remedy: Move the AUTO/OFF/MANUAL switch to the AUTO position for automatic starting..
Low Fuel LED. Remedy: Check fuel level and replenish as required. See Engine Manual for fuel system priming procedure..