FG Wilson
FG Wilson 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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AL01
Generator fails to start on automatic demand; controller shows AL01 – Low Oil Pressure Shutdown
Low Oil Pressure Protection Trip
AL02
Generator shuts down shortly after start; controller displays AL02 – High Engine Temperature
Engine Overtemperature Shutdown
AL03
Generator will not crank; controller shows AL03 – Emergency Stop Active
Emergency Stop Circuit Open
AL04
Generator fails to start; controller displays AL04 – Low Fuel Level Shutdown or Warning
Low Fuel Level Protection
AL05
Generator shuts down during operation; controller shows AL05 – Overspeed Shutdown
Engine Overspeed Detection
AL06
Generator shuts down; controller displays AL06 – Underspeed / Underfrequency
Engine Underspeed Protection Trip
AL07
Generator will not crank; controller shows AL07 – Battery Voltage Low
Low DC Cranking Battery Voltage
AL08
Generator controller shows AL08 – Battery Voltage High while on float charge
High DC Battery Voltage
AL09
Generator shuts down; controller displays AL09 – Low Coolant Level
Low Engine Coolant Level Detection
AL10
Generator shuts down; controller shows AL10 – Low Oil Level (if separate level sensor fitted)
Low Engine Oil Level Detection
AL11
Generator fails to start; controller displays AL11 – Crank Failure / Overcrank
Failure to Start Within Allowed Crank Attempts
AL12
Generator shuts down; controller shows AL12 – Generator Overvoltage
AC Output Overvoltage Protection
AL13
Generator shuts down; controller displays AL13 – Generator Undervoltage
AC Output Undervoltage Protection
AL14
Controller shows AL14 – Phase Rotation / Wrong Phase Sequence
Incorrect Phase Rotation Detection
AL15
Controller displays AL15 – Earth Fault / Ground Fault
Generator Earth Fault Protection Trip
AL16
Controller shows AL16 – Generator Overcurrent / Overload
Overcurrent Protection Trip
AL17
Controller displays AL17 – Mains Failure Not Detected / ATS Fault (on integrated systems)
Mains Sensing or ATS Communication Fault
AL18
Controller shows AL18 – CANbus Communication Error (on electronic engines)
Engine ECU to Controller Communication Loss
AL19
Controller displays AL19 – Fuel Leak Detected (if leak sensor fitted)
Fuel Leak Sensor Activation
AL20
Controller shows AL20 – Air Filter Restriction (if differential pressure switch fitted)
Air Intake Restriction
AL21
Controller displays AL21 – Oil Filter Differential Pressure High (if fitted)
Oil Filter Blockage Detection
AL22
Controller shows AL22 – Coolant Temperature Sensor Fault
Coolant Temperature Signal Error
AL23
Controller displays AL23 – Oil Pressure Sensor Fault
Oil Pressure Signal Error
AL24
Controller shows AL24 – Alternator Temperature High (if stator RTD fitted)
Alternator Overtemperature Protection
AL25
Controller displays AL25 – Service Due / Maintenance Reminder
Scheduled Maintenance Interval Reached
Symptom
Corrosion and water found inside generator control panel
Moisture Ingress into Control Panel
Symptom
Excessive black smoke from exhaust during operation
Overfueling or Air Starvation
Symptom
Excessive blue smoke from exhaust during running
Oil Burning in Combustion Chambers
Symptom
Excessive white smoke from exhaust, especially on startup
Incomplete Combustion or Coolant Ingress
Symptom
Generator cranks but does not start; no specific alarm code displayed
No Start – Fuel or Air Related
Symptom
Generator enclosure or alternator area becomes unusually hot; paint discoloration visible
Overheating Due to Poor Ventilation
Symptom
Generator frequency is unstable or fluctuates under steady load
Governor Hunting / Speed Instability
Symptom
Generator output breaker trips immediately when load is applied
Downstream Short Circuit or Ground Fault
Symptom
Generator produces abnormal loud knocking noise from engine
Engine Mechanical Knock
Symptom
Generator runs but produces no AC voltage at terminals
Loss of Excitation / No Output
Symptom
Generator starts but immediately stalls when load is applied
Load-Induced Stalling
Symptom
Generator starts unexpectedly without apparent mains failure
False Start Command / Spurious Auto Start
Symptom
Generator vibrates excessively during operation
Excessive Vibration / Misalignment
Symptom
Generator will not switch load automatically during mains failure, but runs in manual
Automatic Transfer Failure
Symptom
Strong diesel smell around generator even when not running
Fuel Vapor or Minor Leak
Symptom
Visible fuel leak from under the generator base frame
Base Tank or Fuel Line Leakage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| AL01 |
Generator fails to start on automatic demand; controller shows AL01 – Low Oil Pressure Shutdown
|
Low Oil Pressure Protection Trip | View Details |
| AL02 |
Generator shuts down shortly after start; controller displays AL02 – High Engine Temperature
|
Engine Overtemperature Shutdown | View Details |
| AL03 |
Generator will not crank; controller shows AL03 – Emergency Stop Active
|
Emergency Stop Circuit Open | View Details |
| AL04 |
Generator fails to start; controller displays AL04 – Low Fuel Level Shutdown or Warning
|
Low Fuel Level Protection | View Details |
| AL05 |
Generator shuts down during operation; controller shows AL05 – Overspeed Shutdown
|
Engine Overspeed Detection | View Details |
| AL06 |
Generator shuts down; controller displays AL06 – Underspeed / Underfrequency
|
Engine Underspeed Protection Trip | View Details |
| AL07 |
Generator will not crank; controller shows AL07 – Battery Voltage Low
|
Low DC Cranking Battery Voltage | View Details |
| AL08 |
Generator controller shows AL08 – Battery Voltage High while on float charge
|
High DC Battery Voltage | View Details |
| AL09 |
Generator shuts down; controller displays AL09 – Low Coolant Level
|
Low Engine Coolant Level Detection | View Details |
| AL10 |
Generator shuts down; controller shows AL10 – Low Oil Level (if separate level sensor fitted)
|
Low Engine Oil Level Detection | View Details |
| AL11 |
Generator fails to start; controller displays AL11 – Crank Failure / Overcrank
|
Failure to Start Within Allowed Crank Attempts | View Details |
| AL12 |
Generator shuts down; controller shows AL12 – Generator Overvoltage
|
AC Output Overvoltage Protection | View Details |
| AL13 |
Generator shuts down; controller displays AL13 – Generator Undervoltage
|
AC Output Undervoltage Protection | View Details |
| AL14 |
Controller shows AL14 – Phase Rotation / Wrong Phase Sequence
|
Incorrect Phase Rotation Detection | View Details |
| AL15 |
Controller displays AL15 – Earth Fault / Ground Fault
|
Generator Earth Fault Protection Trip | View Details |
| AL16 |
Controller shows AL16 – Generator Overcurrent / Overload
|
Overcurrent Protection Trip | View Details |
| AL17 |
Controller displays AL17 – Mains Failure Not Detected / ATS Fault (on integrated systems)
|
Mains Sensing or ATS Communication Fault | View Details |
| AL18 |
Controller shows AL18 – CANbus Communication Error (on electronic engines)
|
Engine ECU to Controller Communication Loss | View Details |
| AL19 |
Controller displays AL19 – Fuel Leak Detected (if leak sensor fitted)
|
Fuel Leak Sensor Activation | View Details |
| AL20 |
Controller shows AL20 – Air Filter Restriction (if differential pressure switch fitted)
|
Air Intake Restriction | View Details |
| AL21 |
Controller displays AL21 – Oil Filter Differential Pressure High (if fitted)
|
Oil Filter Blockage Detection | View Details |
| AL22 |
Controller shows AL22 – Coolant Temperature Sensor Fault
|
Coolant Temperature Signal Error | View Details |
| AL23 |
Controller displays AL23 – Oil Pressure Sensor Fault
|
Oil Pressure Signal Error | View Details |
| AL24 |
Controller shows AL24 – Alternator Temperature High (if stator RTD fitted)
|
Alternator Overtemperature Protection | View Details |
| AL25 |
Controller displays AL25 – Service Due / Maintenance Reminder
|
Scheduled Maintenance Interval Reached | View Details |
| – |
Corrosion and water found inside generator control panel
|
Moisture Ingress into Control Panel | View Details |
| – |
Excessive black smoke from exhaust during operation
|
Overfueling or Air Starvation | View Details |
| – |
Excessive blue smoke from exhaust during running
|
Oil Burning in Combustion Chambers | View Details |
| – |
Excessive white smoke from exhaust, especially on startup
|
Incomplete Combustion or Coolant Ingress | View Details |
| – |
Generator cranks but does not start; no specific alarm code displayed
|
No Start – Fuel or Air Related | View Details |
| – |
Generator enclosure or alternator area becomes unusually hot; paint discoloration visible
|
Overheating Due to Poor Ventilation | View Details |
| – |
Generator frequency is unstable or fluctuates under steady load
|
Governor Hunting / Speed Instability | View Details |
| – |
Generator output breaker trips immediately when load is applied
|
Downstream Short Circuit or Ground Fault | View Details |
| – |
Generator produces abnormal loud knocking noise from engine
|
Engine Mechanical Knock | View Details |
| – |
Generator runs but produces no AC voltage at terminals
|
Loss of Excitation / No Output | View Details |
| – |
Generator starts but immediately stalls when load is applied
|
Load-Induced Stalling | View Details |
| – |
Generator starts unexpectedly without apparent mains failure
|
False Start Command / Spurious Auto Start | View Details |
| – |
Generator vibrates excessively during operation
|
Excessive Vibration / Misalignment | View Details |
| – |
Generator will not switch load automatically during mains failure, but runs in manual
|
Automatic Transfer Failure | View Details |
| – |
Strong diesel smell around generator even when not running
|
Fuel Vapor or Minor Leak | View Details |
| – |
Visible fuel leak from under the generator base frame
|
Base Tank or Fuel Line Leakage | View Details |
No matching codes found
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