Firman
Firman 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 Pressure Shutdown / Lockout
E02
Generator shuts down shortly after starting and displays E02 on the Firman controller.
High Engine Temperature / Overheat Shutdown
E03
Firman standby generator cranks but does not start and the controller shows E03 after several attempts.
Low Fuel Pressure / Fuel Supply Fault
E04
Generator shuts down during operation and the display shows E04 with no AC output to the home.
Overload / Overcurrent Protection Trip
E05
Firman standby generator runs but the controller shows E05 and AC voltage is unstable or low.
Under-Voltage / AVR Fault
E06
Generator shuts down and displays E06; engine speed appears too high or too low before shutdown.
Over-Speed / Under-Speed Protection
E07
Controller shows E07 and the generator will not crank when AUTO or MANUAL start is requested.
Starter Circuit Fault / No Crank
E08
Generator starts but stops within a few seconds and the display shows E08.
Loss of Engine Speed Signal / Tachometer Fault
E09
Controller displays E09 and the generator will not start in AUTO mode, even during a utility power outage.
Automatic Transfer Switch (ATS) Communication / Feedback Fault
E10
Generator runs but the controller shows E10 and the unit refuses to transfer load.
Frequency Out of Range
E11
Controller shows E11 and the generator shuts down; fuel smell may be present around the unit.
Excessive Fuel / Rich Mixture Fault
E12
Firman controller displays E12 and the generator will not start; battery icon may also be lit.
Low Battery Voltage / Charging System Fault
E13
Controller shows E13 and the generator shuts down unexpectedly during normal operation.
Emergency Stop / Remote Stop Activated
E14
Generator will not start and the display shows E14 indicating an intake air problem.
Air Intake Restriction / Air Filter Fault
E15
Controller displays E15 and the generator shuts down with a strong exhaust smell.
Exhaust Over-Temperature / Restricted Exhaust
E16
Generator display shows E16 and the unit refuses to start in AUTO mode; utility power appears normal.
Utility Sensing Fault / Line Voltage Detection Error
E17
Controller shows E17 and the generator shuts down; oil level appears normal.
Oil Temperature / Oil Level Sensor Fault
E18
Generator controller displays E18 and the unit will not start; a key or security icon may be shown.
Controller Lockout / Security Code Active
E19
Controller shows E19 and the generator shuts down with no obvious mechanical issue.
Internal Controller Error / EEPROM Fault
E20
Generator display shows E20 and the unit will not accept load even though it is running normally.
Ground Fault / Earth Leakage Detection
Symptom
Controller display is blank or unreadable, but the generator may still run.
Display / HMI Failure
Symptom
Generator battery repeatedly goes dead between runs, even though the charger is connected.
Parasitic Battery Drain / Charging Failure
Symptom
Generator cranks but will not start; no error code displayed on the Firman controller.
No-Start Condition Without Code
Symptom
Generator fails to start automatically during scheduled exercise runs, but starts manually.
Auto-Start Scheduling / Exercise Timer Fault
Symptom
Generator frequently starts and stops for short periods even when utility power is stable.
Nuisance Auto-Start / False Utility Loss Detection
Symptom
Generator is excessively loud or produces knocking sounds during operation.
Abnormal Engine Noise
Symptom
Generator is leaking fuel underneath the enclosure or around the fuel system components.
Fuel Leak
Symptom
Generator output voltage is consistently high (above nominal) but no specific error code is displayed.
Over-Voltage Condition Without Code
Symptom
Generator output voltage is consistently low (below nominal) with no error code present.
Under-Voltage Condition Without Code
Symptom
Generator runs but produces no AC power; controller shows normal run status with no fault code.
No AC Output / Open Circuit in Alternator
Symptom
Generator runs but trips its main breaker or house breakers when large loads start (e.g., air conditioner).
Load Starting Surge / Breaker Trip
Symptom
Generator runs roughly, surging up and down in RPM with fluctuating lights in the house.
Engine Hunting / Unstable Speed
Symptom
Generator shuts down after running for a long period under heavy load, with no specific error code.
Thermal Overload / Long-Duration Overload
Symptom
Generator starts and runs but the automatic transfer switch does not transfer the house load to generator power.
No Transfer to Load
Symptom
Generator starts but stalls after 5–30 seconds of running, with no error code on the display.
Warm-Up Stall / Fuel Starvation
Symptom
Generator vibrates excessively, causing the enclosure to rattle and nearby structures to shake.
Excessive Vibration
Symptom
Oil is found pooling under the generator or on the base pan.
Engine Oil Leak
Symptom
Strong fuel or exhaust odor is noticeable around the generator during or after operation.
Odor / Fume 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 Pressure Shutdown / Lockout | View Details |
| E02 |
Generator shuts down shortly after starting and displays E02 on the Firman controller.
|
High Engine Temperature / Overheat Shutdown | View Details |
| E03 |
Firman standby generator cranks but does not start and the controller shows E03 after several attempts.
|
Low Fuel Pressure / Fuel Supply Fault | View Details |
| E04 |
Generator shuts down during operation and the display shows E04 with no AC output to the home.
|
Overload / Overcurrent Protection Trip | View Details |
| E05 |
Firman standby generator runs but the controller shows E05 and AC voltage is unstable or low.
|
Under-Voltage / AVR Fault | View Details |
| E06 |
Generator shuts down and displays E06; engine speed appears too high or too low before shutdown.
|
Over-Speed / Under-Speed Protection | View Details |
| E07 |
Controller shows E07 and the generator will not crank when AUTO or MANUAL start is requested.
|
Starter Circuit Fault / No Crank | View Details |
| E08 |
Generator starts but stops within a few seconds and the display shows E08.
|
Loss of Engine Speed Signal / Tachometer Fault | View Details |
| E09 |
Controller displays E09 and the generator will not start in AUTO mode, even during a utility power outage.
|
Automatic Transfer Switch (ATS) Communication / Feedback Fault | View Details |
| E10 |
Generator runs but the controller shows E10 and the unit refuses to transfer load.
|
Frequency Out of Range | View Details |
| E11 |
Controller shows E11 and the generator shuts down; fuel smell may be present around the unit.
|
Excessive Fuel / Rich Mixture Fault | View Details |
| E12 |
Firman controller displays E12 and the generator will not start; battery icon may also be lit.
|
Low Battery Voltage / Charging System Fault | View Details |
| E13 |
Controller shows E13 and the generator shuts down unexpectedly during normal operation.
|
Emergency Stop / Remote Stop Activated | View Details |
| E14 |
Generator will not start and the display shows E14 indicating an intake air problem.
|
Air Intake Restriction / Air Filter Fault | View Details |
| E15 |
Controller displays E15 and the generator shuts down with a strong exhaust smell.
|
Exhaust Over-Temperature / Restricted Exhaust | View Details |
| E16 |
Generator display shows E16 and the unit refuses to start in AUTO mode; utility power appears normal.
|
Utility Sensing Fault / Line Voltage Detection Error | View Details |
| E17 |
Controller shows E17 and the generator shuts down; oil level appears normal.
|
Oil Temperature / Oil Level Sensor Fault | View Details |
| E18 |
Generator controller displays E18 and the unit will not start; a key or security icon may be shown.
|
Controller Lockout / Security Code Active | View Details |
| E19 |
Controller shows E19 and the generator shuts down with no obvious mechanical issue.
|
Internal Controller Error / EEPROM Fault | View Details |
| E20 |
Generator display shows E20 and the unit will not accept load even though it is running normally.
|
Ground Fault / Earth Leakage Detection | View Details |
| – |
Controller display is blank or unreadable, but the generator may still run.
|
Display / HMI Failure | View Details |
| – |
Generator battery repeatedly goes dead between runs, even though the charger is connected.
|
Parasitic Battery Drain / Charging Failure | View Details |
| – |
Generator cranks but will not start; no error code displayed on the Firman controller.
|
No-Start Condition Without Code | View Details |
| – |
Generator fails to start automatically during scheduled exercise runs, but starts manually.
|
Auto-Start Scheduling / Exercise Timer Fault | View Details |
| – |
Generator frequently starts and stops for short periods even when utility power is stable.
|
Nuisance Auto-Start / False Utility Loss Detection | View Details |
| – |
Generator is excessively loud or produces knocking sounds during operation.
|
Abnormal Engine Noise | View Details |
| – |
Generator is leaking fuel underneath the enclosure or around the fuel system components.
|
Fuel Leak | View Details |
| – |
Generator output voltage is consistently high (above nominal) but no specific error code is displayed.
|
Over-Voltage Condition Without Code | View Details |
| – |
Generator output voltage is consistently low (below nominal) with no error code present.
|
Under-Voltage Condition Without Code | View Details |
| – |
Generator runs but produces no AC power; controller shows normal run status with no fault code.
|
No AC Output / Open Circuit in Alternator | View Details |
| – |
Generator runs but trips its main breaker or house breakers when large loads start (e.g., air conditioner).
|
Load Starting Surge / Breaker Trip | View Details |
| – |
Generator runs roughly, surging up and down in RPM with fluctuating lights in the house.
|
Engine Hunting / Unstable Speed | View Details |
| – |
Generator shuts down after running for a long period under heavy load, with no specific error code.
|
Thermal Overload / Long-Duration Overload | View Details |
| – |
Generator starts and runs but the automatic transfer switch does not transfer the house load to generator power.
|
No Transfer to Load | View Details |
| – |
Generator starts but stalls after 5–30 seconds of running, with no error code on the display.
|
Warm-Up Stall / Fuel Starvation | View Details |
| – |
Generator vibrates excessively, causing the enclosure to rattle and nearby structures to shake.
|
Excessive Vibration | View Details |
| – |
Oil is found pooling under the generator or on the base pan.
|
Engine Oil Leak | View Details |
| – |
Strong fuel or exhaust odor is noticeable around the generator during or after operation.
|
Odor / Fume Issue | View Details |
No matching codes found
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