Wacker Neuson
Wacker Neuson Standby Generators Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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E01
Generator will not start; controller displays E01 and immediately shuts down crank cycle.
Low Oil Pressure Shutdown
E02
Generator shuts down shortly after start; controller shows E02.
High Engine Temperature / Overheat Shutdown
E03
Controller displays E03 and prevents a start attempt.
Emergency Stop Activated
E04
Generator cranks but does not start; controller shows E04 after several attempts.
No Crank Acknowledgment / Start Failure
E05
Generator starts then stops within a few seconds; controller logs E05.
Low Fuel Level / Fuel Supply Fault
E06
Controller shows E06 and shuts down the generator under load.
Overfrequency / Engine Overspeed
E07
Generator shuts down and displays E07 when large loads are applied.
Underfrequency / Engine Underspeed
E08
Controller shows E08 and prevents the generator from connecting to the load.
Overvoltage Protection Trip
E09
Controller displays E09 and shuts down the generator under load.
Undervoltage Protection Trip
E10
Generator will not start; controller shows E10 immediately after the start command.
Battery Voltage Low
E11
Controller shows E11 and logs multiple failed start attempts.
Overcrank / Failed to Start
E12
Generator shuts down and displays E12 shortly after starting, even with no load.
High Exhaust Temperature / Turbo Overheat (diesel models)
E13
Controller displays E13 and prevents the generator from entering AUTO mode.
Controller Internal Fault / EEPROM Error
E14
The generator stops and E14 is logged when mains/utility power returns.
Synchronization / Phase Sequence Error (for ATS-equipped systems)
E15
The controller shows E15 and the generator shuts down during operation.
Fuel Level Sensor Fault
E16
The generator shuts down with E16 when the oil temperature rises, even though the coolant temperature is normal.
High Oil Temperature Shutdown
E17
The controller displays E17 and logs it during the cranking phase.
Crank Disconnect Failure (Starter Not Disengaging)
E18
The generator stops and E18 is recorded when a load is applied to one phase.
Current Imbalance / Overcurrent on Single Phase
E19
The controller shows E19 and prevents automatic start when utility power fails.
Mains/Utility Sensing Fault
E20
The generator shuts down with E20 and a strong fuel smell is present.
Fuel Leak Detected / Fuel Pressure Anomaly (where equipped)
Symptom
Blue smoke from the exhaust and noticeable oil consumption.
Oil Burning / Internal Engine Wear
Symptom
Controller display is blank or intermittent; the generator otherwise runs.
Control Panel Power / Display Failure
Symptom
Excessive black smoke from the exhaust during operation.
Overfueling / Incomplete Combustion (Diesel)
Symptom
Generator output voltage is present but fluctuates significantly under a steady load.
Unstable Voltage Regulation
Symptom
Generator starts and stops repeatedly without stabilizing; no specific code is shown.
Hunting / Unstable Engine Speed
Symptom
Generator will not shut down when commanded by the controller; the engine continues to run.
Shutdown Solenoid / Stop Circuit Failure
Symptom
Moisture or water found inside the generator enclosure; corrosion visible on components.
Water Ingress / Environmental Sealing Failure
Symptom
Noticeable electrical buzzing or humming from the alternator, with possible heat buildup.
Alternator Electrical Imbalance / Loose Laminations
Symptom
Strong fuel odor around the generator even when not running.
Static Fuel Leak / Evaporation Issue
Symptom
The generator fails to start automatically on utility failure but starts manually.
Auto Start Control Circuit Fault
Symptom
The generator is leaking coolant under the unit or inside the enclosure.
Cooling System Leak
Symptom
The generator overheats, but no specific overtemperature code is shown; coolant boils over.
Cooling System Inefficiency / Overheating Without Sensor Trip
Symptom
The generator produces a loud knocking or banging noise from the engine area.
Internal Engine Knock / Mechanical Damage
Symptom
The generator runs but does not transfer power to the building; no error code is displayed.
Automatic Transfer Switch (ATS) Fails to Transfer Load
Symptom
The generator starts and runs, but building lights flicker noticeably.
Voltage/Frequency Fluctuation Under Load
Symptom
The generator vibrates excessively during operation, causing the enclosure or frame to shake.
Excessive Vibration / Misalignment
Symptom
The generator's main circuit breaker trips repeatedly under moderate load.
Overcurrent / Short Circuit Protection Trip
Symptom
White smoke from the exhaust, especially at startup, with rough running.
Incomplete Combustion / Low Cylinder Temperature
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start; controller displays E01 and immediately shuts down crank cycle.
|
Low Oil Pressure Shutdown | View Details |
| E02 |
Generator shuts down shortly after start; controller shows E02.
|
High Engine Temperature / Overheat Shutdown | View Details |
| E03 |
Controller displays E03 and prevents a start attempt.
|
Emergency Stop Activated | View Details |
| E04 |
Generator cranks but does not start; controller shows E04 after several attempts.
|
No Crank Acknowledgment / Start Failure | View Details |
| E05 |
Generator starts then stops within a few seconds; controller logs E05.
|
Low Fuel Level / Fuel Supply Fault | View Details |
| E06 |
Controller shows E06 and shuts down the generator under load.
|
Overfrequency / Engine Overspeed | View Details |
| E07 |
Generator shuts down and displays E07 when large loads are applied.
|
Underfrequency / Engine Underspeed | View Details |
| E08 |
Controller shows E08 and prevents the generator from connecting to the load.
|
Overvoltage Protection Trip | View Details |
| E09 |
Controller displays E09 and shuts down the generator under load.
|
Undervoltage Protection Trip | View Details |
| E10 |
Generator will not start; controller shows E10 immediately after the start command.
|
Battery Voltage Low | View Details |
| E11 |
Controller shows E11 and logs multiple failed start attempts.
|
Overcrank / Failed to Start | View Details |
| E12 |
Generator shuts down and displays E12 shortly after starting, even with no load.
|
High Exhaust Temperature / Turbo Overheat (diesel models) | View Details |
| E13 |
Controller displays E13 and prevents the generator from entering AUTO mode.
|
Controller Internal Fault / EEPROM Error | View Details |
| E14 |
The generator stops and E14 is logged when mains/utility power returns.
|
Synchronization / Phase Sequence Error (for ATS-equipped systems) | View Details |
| E15 |
The controller shows E15 and the generator shuts down during operation.
|
Fuel Level Sensor Fault | View Details |
| E16 |
The generator shuts down with E16 when the oil temperature rises, even though the coolant temperature is normal.
|
High Oil Temperature Shutdown | View Details |
| E17 |
The controller displays E17 and logs it during the cranking phase.
|
Crank Disconnect Failure (Starter Not Disengaging) | View Details |
| E18 |
The generator stops and E18 is recorded when a load is applied to one phase.
|
Current Imbalance / Overcurrent on Single Phase | View Details |
| E19 |
The controller shows E19 and prevents automatic start when utility power fails.
|
Mains/Utility Sensing Fault | View Details |
| E20 |
The generator shuts down with E20 and a strong fuel smell is present.
|
Fuel Leak Detected / Fuel Pressure Anomaly (where equipped) | View Details |
| – |
Blue smoke from the exhaust and noticeable oil consumption.
|
Oil Burning / Internal Engine Wear | View Details |
| – |
Controller display is blank or intermittent; the generator otherwise runs.
|
Control Panel Power / Display Failure | View Details |
| – |
Excessive black smoke from the exhaust during operation.
|
Overfueling / Incomplete Combustion (Diesel) | View Details |
| – |
Generator output voltage is present but fluctuates significantly under a steady load.
|
Unstable Voltage Regulation | View Details |
| – |
Generator starts and stops repeatedly without stabilizing; no specific code is shown.
|
Hunting / Unstable Engine Speed | View Details |
| – |
Generator will not shut down when commanded by the controller; the engine continues to run.
|
Shutdown Solenoid / Stop Circuit Failure | View Details |
| – |
Moisture or water found inside the generator enclosure; corrosion visible on components.
|
Water Ingress / Environmental Sealing Failure | View Details |
| – |
Noticeable electrical buzzing or humming from the alternator, with possible heat buildup.
|
Alternator Electrical Imbalance / Loose Laminations | View Details |
| – |
Strong fuel odor around the generator even when not running.
|
Static Fuel Leak / Evaporation Issue | View Details |
| – |
The generator fails to start automatically on utility failure but starts manually.
|
Auto Start Control Circuit Fault | View Details |
| – |
The generator is leaking coolant under the unit or inside the enclosure.
|
Cooling System Leak | View Details |
| – |
The generator overheats, but no specific overtemperature code is shown; coolant boils over.
|
Cooling System Inefficiency / Overheating Without Sensor Trip | View Details |
| – |
The generator produces a loud knocking or banging noise from the engine area.
|
Internal Engine Knock / Mechanical Damage | View Details |
| – |
The generator runs but does not transfer power to the building; no error code is displayed.
|
Automatic Transfer Switch (ATS) Fails to Transfer Load | View Details |
| – |
The generator starts and runs, but building lights flicker noticeably.
|
Voltage/Frequency Fluctuation Under Load | View Details |
| – |
The generator vibrates excessively during operation, causing the enclosure or frame to shake.
|
Excessive Vibration / Misalignment | View Details |
| – |
The generator's main circuit breaker trips repeatedly under moderate load.
|
Overcurrent / Short Circuit Protection Trip | View Details |
| – |
White smoke from the exhaust, especially at startup, with rough running.
|
Incomplete Combustion / Low Cylinder Temperature | View Details |
No matching codes found
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