WEN
WEN 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 and the controller display shows E01 immediately after a start attempt.
Low Oil Shutdown / Low Oil Pressure Lockout
E02
Generator cranks but will not start; controller shows E02 after several failed attempts.
No Fuel / Fuel Supply Fault
E03
Generator starts then shuts down within a few seconds; controller displays E03.
Overspeed / Engine Speed Out of Range
E04
Generator shuts down during operation and displays E04 on the controller.
High Engine Temperature / Overheat Shutdown
E05
Generator will not crank; controller shows E05 when a start is attempted.
Low Battery Voltage / Battery Protection Lockout
E06
Generator attempts to crank but stops abruptly; controller displays E06.
Starter Overcurrent / Starter Fault
E07
Generator runs but controller shows E07 and the unit may shut down under load.
Low AC Output Voltage
E08
Generator shuts down and displays E08 when heavy loads are applied.
Overload / Overcurrent Protection Trip
E09
Controller shows E09 and the generator will not transfer load even though it is running.
Frequency Out of Range / Hz Fault
E10
Generator will not start automatically on utility failure; controller logs E10.
Automatic Start / Remote Start Circuit Fault
E11
Controller displays E11 and the generator shuts down shortly after starting.
Low Oil Level Sensor Fault / Oil Sensor Circuit Error
E12
Controller shows E12 and prevents starting; often appears after a long storage period.
Fuel Level Sensor Fault / Empty Fuel Lockout (for diesel or tanked models)
E13
Generator runs but controller displays E13 and may derate or shut down.
High AC Voltage / Overvoltage Protection
E14
Controller displays E14 and the generator will not start or shuts down unexpectedly.
Emergency Stop / E‑Stop Circuit Active
E15
Controller shows E15 and the generator refuses to start after several failed attempts.
Excessive Crank Attempts / Start Retry Lockout
E16
Controller displays E16 and the generator will not accept load from the transfer switch.
Transfer Switch Communication / Feedback Fault
E17
Controller shows E17 and logs a fault shortly after the generator starts and transfers load.
Reverse Power / Backfeed Detection Fault
E18
Controller displays E18 and the generator shuts down during operation without obvious mechanical issues.
Control Board Internal Error / EEPROM or Firmware Fault
E19
Controller shows E19 and prevents starting; often associated with sensor wiring issues.
Analog Sensor Input Fault (Generic) / Sensor Out of Range
E20
Controller displays E20 and the generator will not start; often after a recent service.
Incorrect Phase or Voltage Configuration / Parameter Mismatch
Symptom
Automatic weekly exercise test does not run even though the generator works in manual mode.
Exercise Timer / Scheduler Malfunction
Symptom
Battery repeatedly goes dead between exercise cycles; generator may not start when needed.
Battery Charging System Failure
Symptom
Controller display is blank or intermittent even though the battery is good.
Controller Power / Display Failure
Symptom
Corrosion, rust, or water accumulation observed inside the WEN generator enclosure.
Moisture Intrusion / Enclosure Seal Failure
Symptom
Generator cranks but will not start; no error code displayed on the WEN controller.
Ignition System Failure
Symptom
Generator is excessively loud or produces unusual knocking, rattling, or metallic noises during operation.
Mechanical Noise / Mounting or Internal Engine Issue
Symptom
Generator output voltage is correct but lights flicker and sensitive electronics behave erratically when on generator power.
Voltage Fluctuation / Poor Regulation Under Load
Symptom
Generator runs but carbon monoxide (CO) alarm in the home or near the unit frequently activates.
Exhaust Fume Hazard / Improper Venting
Symptom
Generator runs but produces no AC power at the output lugs; controller shows normal run status with no code.
Loss of Excitation / Alternator Not Producing Voltage
Symptom
Generator runs but the automatic transfer switch does not transfer load to the WEN generator during an outage.
Transfer Switch Mechanical or Control Failure
Symptom
Generator runs but trips its main breaker or shuts down when large motors (like well pumps or AC compressors) start.
Motor Starting Overload / Insufficient Capacity
Symptom
Generator shuts down after running for a short time and is very hot to the touch; no specific error code shown.
Overheating Due to Restricted Airflow
Symptom
Generator starts and runs but shuts down when the enclosure doors are closed; runs normally with doors open.
Airflow Restriction or Overheat Triggered by Enclosure Closure
Symptom
Generator starts but stalls or surges repeatedly, especially under light load; no error code shown.
Carburetor Contamination / Fuel Metering Problem
Symptom
Generator vibrates excessively, causing the enclosure to shake and nearby structures to rattle.
Excessive Vibration / Imbalance
Symptom
Noticeable oil leak under the generator or oil spots inside the WEN enclosure.
Engine Oil Leak
Symptom
Strong fuel smell around the WEN standby generator, especially during or after operation.
Fuel Leak / Fuel System Integrity Issue
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start and the controller display shows E01 immediately after a start attempt.
|
Low Oil Shutdown / Low Oil Pressure Lockout | View Details |
| E02 |
Generator cranks but will not start; controller shows E02 after several failed attempts.
|
No Fuel / Fuel Supply Fault | View Details |
| E03 |
Generator starts then shuts down within a few seconds; controller displays E03.
|
Overspeed / Engine Speed Out of Range | View Details |
| E04 |
Generator shuts down during operation and displays E04 on the controller.
|
High Engine Temperature / Overheat Shutdown | View Details |
| E05 |
Generator will not crank; controller shows E05 when a start is attempted.
|
Low Battery Voltage / Battery Protection Lockout | View Details |
| E06 |
Generator attempts to crank but stops abruptly; controller displays E06.
|
Starter Overcurrent / Starter Fault | View Details |
| E07 |
Generator runs but controller shows E07 and the unit may shut down under load.
|
Low AC Output Voltage | View Details |
| E08 |
Generator shuts down and displays E08 when heavy loads are applied.
|
Overload / Overcurrent Protection Trip | View Details |
| E09 |
Controller shows E09 and the generator will not transfer load even though it is running.
|
Frequency Out of Range / Hz Fault | View Details |
| E10 |
Generator will not start automatically on utility failure; controller logs E10.
|
Automatic Start / Remote Start Circuit Fault | View Details |
| E11 |
Controller displays E11 and the generator shuts down shortly after starting.
|
Low Oil Level Sensor Fault / Oil Sensor Circuit Error | View Details |
| E12 |
Controller shows E12 and prevents starting; often appears after a long storage period.
|
Fuel Level Sensor Fault / Empty Fuel Lockout (for diesel or tanked models) | View Details |
| E13 |
Generator runs but controller displays E13 and may derate or shut down.
|
High AC Voltage / Overvoltage Protection | View Details |
| E14 |
Controller displays E14 and the generator will not start or shuts down unexpectedly.
|
Emergency Stop / E‑Stop Circuit Active | View Details |
| E15 |
Controller shows E15 and the generator refuses to start after several failed attempts.
|
Excessive Crank Attempts / Start Retry Lockout | View Details |
| E16 |
Controller displays E16 and the generator will not accept load from the transfer switch.
|
Transfer Switch Communication / Feedback Fault | View Details |
| E17 |
Controller shows E17 and logs a fault shortly after the generator starts and transfers load.
|
Reverse Power / Backfeed Detection Fault | View Details |
| E18 |
Controller displays E18 and the generator shuts down during operation without obvious mechanical issues.
|
Control Board Internal Error / EEPROM or Firmware Fault | View Details |
| E19 |
Controller shows E19 and prevents starting; often associated with sensor wiring issues.
|
Analog Sensor Input Fault (Generic) / Sensor Out of Range | View Details |
| E20 |
Controller displays E20 and the generator will not start; often after a recent service.
|
Incorrect Phase or Voltage Configuration / Parameter Mismatch | View Details |
| – |
Automatic weekly exercise test does not run even though the generator works in manual mode.
|
Exercise Timer / Scheduler Malfunction | View Details |
| – |
Battery repeatedly goes dead between exercise cycles; generator may not start when needed.
|
Battery Charging System Failure | View Details |
| – |
Controller display is blank or intermittent even though the battery is good.
|
Controller Power / Display Failure | View Details |
| – |
Corrosion, rust, or water accumulation observed inside the WEN generator enclosure.
|
Moisture Intrusion / Enclosure Seal Failure | View Details |
| – |
Generator cranks but will not start; no error code displayed on the WEN controller.
|
Ignition System Failure | View Details |
| – |
Generator is excessively loud or produces unusual knocking, rattling, or metallic noises during operation.
|
Mechanical Noise / Mounting or Internal Engine Issue | View Details |
| – |
Generator output voltage is correct but lights flicker and sensitive electronics behave erratically when on generator power.
|
Voltage Fluctuation / Poor Regulation Under Load | View Details |
| – |
Generator runs but carbon monoxide (CO) alarm in the home or near the unit frequently activates.
|
Exhaust Fume Hazard / Improper Venting | View Details |
| – |
Generator runs but produces no AC power at the output lugs; controller shows normal run status with no code.
|
Loss of Excitation / Alternator Not Producing Voltage | View Details |
| – |
Generator runs but the automatic transfer switch does not transfer load to the WEN generator during an outage.
|
Transfer Switch Mechanical or Control Failure | View Details |
| – |
Generator runs but trips its main breaker or shuts down when large motors (like well pumps or AC compressors) start.
|
Motor Starting Overload / Insufficient Capacity | View Details |
| – |
Generator shuts down after running for a short time and is very hot to the touch; no specific error code shown.
|
Overheating Due to Restricted Airflow | View Details |
| – |
Generator starts and runs but shuts down when the enclosure doors are closed; runs normally with doors open.
|
Airflow Restriction or Overheat Triggered by Enclosure Closure | View Details |
| – |
Generator starts but stalls or surges repeatedly, especially under light load; no error code shown.
|
Carburetor Contamination / Fuel Metering Problem | View Details |
| – |
Generator vibrates excessively, causing the enclosure to shake and nearby structures to rattle.
|
Excessive Vibration / Imbalance | View Details |
| – |
Noticeable oil leak under the generator or oil spots inside the WEN enclosure.
|
Engine Oil Leak | View Details |
| – |
Strong fuel smell around the WEN standby generator, especially during or after operation.
|
Fuel Leak / Fuel System Integrity Issue | View Details |
No matching codes found
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