| 1 | One blink | Shutdown due to high engine temperature | Shutdown | Open sea valve; clean sea water strainer; check coolant level and repair leaks; check/replace raw water hoses; readjust a loose pump belt (p. 4-9); replace worn raw water impeller (p. 4-10); clean heat exchanger (p. 4-12); check through-hull; drain/clean cooling system (p. 4-6); replace coolant thermostat (p. 4-8); tighten coolant sender E2 ring terminal; test/replace sender E2; check continuity Pin 9 to E2 |
| 12 | Overvoltage | Output voltage jumped to more than 125% of rated for 75 ms or more than 115% of rated for 3 s after voltage regulation enabled | Shutdown | See an authorized Onan service representative. |
| 13 | Undervoltage | Output voltage fell to less than 90% of rated for 5 seconds after voltage regulation enabled | Shutdown | Turn line breaker OFF, disconnect PTO, reduce loads; fill fuel tank; check fuel fittings and filters; replace fuel filters. |
| 14 | Overfrequency | Frequency jumped to more than 70 Hz for 40 ms or more than 2% over nominal for 6 seconds | Shutdown | Reset breaker after starting, tighten fuel fittings, prime fuel system |
| 15 | Underfrequency | Frequency fell to less than 90% of nominal for more than 8 seconds during normal operation | Shutdown | Turn breaker OFF, de-energize PTO, reduce loads; fill fuel; prime fuel system; remove air/exhaust blockages; check fuel fittings; replace fuel filters; check for contaminated fuel. |
| 17 | Overprime | Prime mode exceeded 5 minutes | Shutdown | Remove object holding control switch in prime position |
| 2 | Two blinks | Two blinks indicate shutdown due to low oil pressure. | Shutdown | Check oil level; tighten sender E1 ring terminal; check sender E1 resistance and replace if necessary; check continuity Pin 10 to E1; replace sender with a gauge and service the engine lubrication system if oil pressure is less than 14 psi (98 kPa) |
| 22 | Governor Overload | Maximum allowable time at full-duty cycle was exceeded | Shutdown | Reduce the number of appliances running at the same time; check the fuel tank and fill; remove any blockage in the combustion air inlet or exhaust system; check fuel fittings for leaks and reprime; replace the fuel filters and reprime. |
| 23 | Faulty Oil Pressure Sender | Controller sensed grounded sender | Warning | Tighten the ring terminal on sender E1; check continuity between Pin 10 and ring terminal E1-1; test sender E1 and replace as necessary; replace the genset controller |
| 24 | Faulty Temperature Sender | Controller sensed open sender | Warning | Tighten the ring terminal on sender E2; check continuity between Pin 9 and ring terminal E2-1; test sender E2 and replace as necessary; replace the genset controller |
| 27 | Loss of Voltage Sense | The genset Controller lost VAC sensing during normal voltage regulation when the field was functioning normally and frequency was at least 40 Hz | Shutdown | See an authorized Onan service representative. |
| 29 | High Battery Voltage | During startup the genset Controller sensed that battery system voltage was greater than 19.2 volts | Warning | Check battery voltage, battery connections, battery charge rate. |
| 3 | Three blinks | Three blinks indicate shutdown requiring service by trained and experienced service personnel. | Warning | See Troubleshooting in the Operator's Manual |
| 32 | Starting Fault | The genset Controller could not detect cranking speed (quadrature zero crossings) for 3 seconds | Shutdown | Have the propulsion engines running while trying to start the genset; service the battery; change to oil of proper viscosity for the ambient temperature. |
| 35 | Control Card Failure–EE | Microprocessor EEPROM error during self-test | Shutdown | Verify fault. |
| 36 | Unknown Shutdown | The genset Controller declared this fault because engine speed fell below 1000 RPM for 0.5 seconds, though not by genset or engine control action | Shutdown | Reduce the number of loads on the genset; check fuel level and refill; prime the fuel system for at least 30 seconds; check fuel fittings for leaks and reprime; replace the fuel filters and reprime. |
| 37 | Invalid Set Configuration | The genset controller is not configured properly for the genset | Warning | See an authorized Onan service representative. |
| 38 | Field Overload | High field voltage induced by high rotor temperature or low power factor loads | Shutdown | Remove generator air flow blockages; reduce appliances; have air conditioners and other appliances checked. |
| 4 | Overcrank | Shutdown due to a failure to start within the time allowed for cranking | Shutdown | Push line circuit breaker OFF; check fuel tank and fill; remove combustion air or exhaust blockages; open closed fuel valves; prime the fuel system at least 30 seconds; service the battery; check all fuel filters and fittings and reprime; replace fuel filters; change to proper oil viscosity; conduct fuel pump test; inspect glow plugs; service fuel injectors and worn engine |
| 41 | Grounded Rotor | F+ grounded | Shutdown | Verify fault. |
| 42 | Processor Failure | Microprocessor ROM error during self-test | Shutdown | Verify fault. |
| 43 | Processor Failure | Microprocessor RAM error during self-test | Shutdown | Verify fault. |
| 45 | Speed Sense Lost | Controller lost speed sense (quadrature zero crossings) for 0.25 seconds after start disconnect | Shutdown | See an authorized Onan service representative. |
| 46 | Genset Overload | The genset Controller shutdown the genset because engine load exceeded 135 percent of genset rating for 10 seconds | Shutdown | Reduce the number of loads on the genset. |
| 48 | Processor Failure | Controller unable to sense field voltage | Shutdown | Verify fault. |
| 5 | Warning—Shutdown Due to Vessel CO | Shutdown due to Vessel CO | Warning | Get everyone out into fresh air immediately and seek medical attention. |
| 57 | Overprime | A local or remote control switch was held in the Prime position for more than 5 minutes | Warning | Remove object holding switch in prime position, replace faulty control switch |
| 58 | High Exhaust Temperature | Exhaust temperature rises because of loss of water | Shutdown | Reconnect/replace raw water hoses, replace impeller |
| 59 | Low Coolant Level | The engine coolant level fell below the optional coolant level sensor | Warning | Add coolant, repair leaks |
| 61 | External Shutdown | The generator set was shut down by a fire suppression system or other external control | Shutdown | Make necessary repairs and reset the external control which shut down the genset |
| 7 | Seven blinks | Water stops flowing | Shutdown | Open the sea cock; check for and clean a blocked sea water strainer; check for kinked or leaking hoses; check/replace the raw water impeller; check the hull through-hull fitting for blockage. |
| Code No. 5 | Warning - Shutdown due to Vessel CO | Shutdown occurring due to the vessel CO detector | Warning | All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual. |
| Code No. 61 | Emergency Shutdown | Shutdown occurring due to external emergency shutdown device | Shutdown | All status indicator lights in the control circuit will also blink the fault code. See Troubleshooting Chapter of the Operator Manual. |