Briggs & Stratton
Briggs & Stratton 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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COMM
Controller displays COMM or COMMS LOSS and remote monitoring or ATS communication fails.
Communication Bus Fault
ESTOP
Controller displays ESTOP or EMERGENCY STOP and generator will not crank.
Emergency Stop Circuit Active
EXER
Controller displays EXER FAIL or EXERCISE FAILED after a scheduled exercise period.
Failed Exercise Run
HBT
Controller displays HBT or HIGH BAT and may shut down charging or log a fault.
High Battery Voltage Fault
HET
Controller displays HET or HIGH ENG TEMP and generator shuts down during or shortly after running.
High Engine Temperature Shutdown
HF
Controller displays HF and generator shuts down or refuses to transfer load.
Overfrequency / Engine Overspeed Fault
HOV
Controller displays HOV and generator shuts down or drops load.
High Output Voltage Fault
IGN
Controller displays IGN or IGNITION FAULT and generator cranks but does not start.
Ignition System Failure
LOAC
Controller displays LOAC or NO AC and generator runs but transfer switch does not transfer load.
Loss of AC Sensing / No Output Detected by Controller
LOBT
Controller displays LOBT or LOW BAT and generator will not crank or cranks slowly.
Low Battery Voltage Fault
LOF
Controller displays LOF and generator shuts down or will not start.
Loss of Frequency / Loss of Engine Speed Signal
LOFUEL
Controller displays LO FUEL or LOW FUEL (LP tank models) and generator will not run a full cycle.
Low Fuel Level / Fuel Supply Fault
LOP
Controller displays LOP and generator will not start or shuts down shortly after starting.
Low Oil Pressure Shutdown
LOUT
Controller displays LOUT or LOW UTILITY and generator starts even though utility power seems present.
Low Utility Voltage Sensing Fault
LOV
Controller displays LOV and generator shuts down or will not accept load.
Low Output Voltage Fault
OC
Controller displays OC and generator will not start or shuts down shortly after cranking.
Overcrank Fault
OL
Controller displays OL and generator shuts down when loads are applied.
Overload Fault
SEN
Controller displays SEN or SENSOR FAULT and may prevent starting.
Engine Sensor Input Fault
UF
Controller displays UF and generator shuts down or will not transfer load.
Underfrequency / Engine Underspeed Fault
Symptom
Corrosion or rust visible inside generator enclosure, on wiring, or on engine components.
Corrosion and Moisture Intrusion
Symptom
Fuel smell around generator or visible fuel leakage from unit.
Fuel Leak
Symptom
Generator cranks but will not start (no error code displayed).
No-Start Condition Without Logged Fault
Symptom
Generator enclosure panels rattle or vibrate loudly during operation.
Loose Enclosure Panels
Symptom
Generator fails to run scheduled weekly exercise (no start at programmed time).
Exercise Function Not Operating
Symptom
Generator is excessively loud or has unusual knocking or rattling noises during operation.
Abnormal Mechanical Noise
Symptom
Generator runs but does not transfer power to the house during an outage.
Failure to Transfer Load
Symptom
Generator runs but trips its internal breaker or external breaker frequently.
Repeated Breaker Tripping
Symptom
Generator runs rough, surges, or hunts at no load.
Unstable Engine Speed / Surging
Symptom
Generator starts and runs but output voltage or frequency is out of specification when measured with a meter.
Out-of-Spec Voltage or Frequency
Symptom
Generator starts but immediately shuts down after a few seconds, no code or only generic shutdown.
Run-Then-Stop Condition
Symptom
Generator transfers power but house lights flicker or dim when large loads start.
Voltage Sag Under Load
Symptom
Generator vibrates excessively, causing enclosure or nearby structures to shake.
Excessive Vibration
Symptom
Generator will not crank at all when a power outage occurs (no click, no attempt to start).
No-Crank on Utility Failure
Symptom
Ice or snow buildup around generator causing poor performance or shutdowns in winter.
Environmental Obstruction / Cold Weather Operation Issues
Symptom
Remote monitoring system or Wi‑Fi module shows generator offline or not reporting status.
Remote Monitoring Communication Failure
Symptom
Starter cranks slowly or intermittently, especially in cold weather.
Weak Cranking Performance
Symptom
Strong exhaust smell or fumes entering nearby building during generator operation.
Exhaust Fume Intrusion
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| COMM |
Controller displays COMM or COMMS LOSS and remote monitoring or ATS communication fails.
|
Communication Bus Fault | View Details |
| ESTOP |
Controller displays ESTOP or EMERGENCY STOP and generator will not crank.
|
Emergency Stop Circuit Active | View Details |
| EXER |
Controller displays EXER FAIL or EXERCISE FAILED after a scheduled exercise period.
|
Failed Exercise Run | View Details |
| HBT |
Controller displays HBT or HIGH BAT and may shut down charging or log a fault.
|
High Battery Voltage Fault | View Details |
| HET |
Controller displays HET or HIGH ENG TEMP and generator shuts down during or shortly after running.
|
High Engine Temperature Shutdown | View Details |
| HF |
Controller displays HF and generator shuts down or refuses to transfer load.
|
Overfrequency / Engine Overspeed Fault | View Details |
| HOV |
Controller displays HOV and generator shuts down or drops load.
|
High Output Voltage Fault | View Details |
| IGN |
Controller displays IGN or IGNITION FAULT and generator cranks but does not start.
|
Ignition System Failure | View Details |
| LOAC |
Controller displays LOAC or NO AC and generator runs but transfer switch does not transfer load.
|
Loss of AC Sensing / No Output Detected by Controller | View Details |
| LOBT |
Controller displays LOBT or LOW BAT and generator will not crank or cranks slowly.
|
Low Battery Voltage Fault | View Details |
| LOF |
Controller displays LOF and generator shuts down or will not start.
|
Loss of Frequency / Loss of Engine Speed Signal | View Details |
| LOFUEL |
Controller displays LO FUEL or LOW FUEL (LP tank models) and generator will not run a full cycle.
|
Low Fuel Level / Fuel Supply Fault | View Details |
| LOP |
Controller displays LOP and generator will not start or shuts down shortly after starting.
|
Low Oil Pressure Shutdown | View Details |
| LOUT |
Controller displays LOUT or LOW UTILITY and generator starts even though utility power seems present.
|
Low Utility Voltage Sensing Fault | View Details |
| LOV |
Controller displays LOV and generator shuts down or will not accept load.
|
Low Output Voltage Fault | View Details |
| OC |
Controller displays OC and generator will not start or shuts down shortly after cranking.
|
Overcrank Fault | View Details |
| OL |
Controller displays OL and generator shuts down when loads are applied.
|
Overload Fault | View Details |
| SEN |
Controller displays SEN or SENSOR FAULT and may prevent starting.
|
Engine Sensor Input Fault | View Details |
| UF |
Controller displays UF and generator shuts down or will not transfer load.
|
Underfrequency / Engine Underspeed Fault | View Details |
| – |
Corrosion or rust visible inside generator enclosure, on wiring, or on engine components.
|
Corrosion and Moisture Intrusion | View Details |
| – |
Fuel smell around generator or visible fuel leakage from unit.
|
Fuel Leak | View Details |
| – |
Generator cranks but will not start (no error code displayed).
|
No-Start Condition Without Logged Fault | View Details |
| – |
Generator enclosure panels rattle or vibrate loudly during operation.
|
Loose Enclosure Panels | View Details |
| – |
Generator fails to run scheduled weekly exercise (no start at programmed time).
|
Exercise Function Not Operating | View Details |
| – |
Generator is excessively loud or has unusual knocking or rattling noises during operation.
|
Abnormal Mechanical Noise | View Details |
| – |
Generator runs but does not transfer power to the house during an outage.
|
Failure to Transfer Load | View Details |
| – |
Generator runs but trips its internal breaker or external breaker frequently.
|
Repeated Breaker Tripping | View Details |
| – |
Generator runs rough, surges, or hunts at no load.
|
Unstable Engine Speed / Surging | View Details |
| – |
Generator starts and runs but output voltage or frequency is out of specification when measured with a meter.
|
Out-of-Spec Voltage or Frequency | View Details |
| – |
Generator starts but immediately shuts down after a few seconds, no code or only generic shutdown.
|
Run-Then-Stop Condition | View Details |
| – |
Generator transfers power but house lights flicker or dim when large loads start.
|
Voltage Sag Under Load | View Details |
| – |
Generator vibrates excessively, causing enclosure or nearby structures to shake.
|
Excessive Vibration | View Details |
| – |
Generator will not crank at all when a power outage occurs (no click, no attempt to start).
|
No-Crank on Utility Failure | View Details |
| – |
Ice or snow buildup around generator causing poor performance or shutdowns in winter.
|
Environmental Obstruction / Cold Weather Operation Issues | View Details |
| – |
Remote monitoring system or Wi‑Fi module shows generator offline or not reporting status.
|
Remote Monitoring Communication Failure | View Details |
| – |
Starter cranks slowly or intermittently, especially in cold weather.
|
Weak Cranking Performance | View Details |
| – |
Strong exhaust smell or fumes entering nearby building during generator operation.
|
Exhaust Fume Intrusion | View Details |
No matching codes found
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