Gillette
Gillette 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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ATS COMM FAIL
Controller shows ATS COMM FAIL or TRANSFER SWITCH COMM ERROR; automatic transfer may not occur.
Communication Loss with Automatic Transfer Switch
CHARGER FAIL
Controller indicates CHARGER FAIL or BATTERY CHARGER ERROR; battery voltage slowly drops over days.
Battery Charger Failure
COOLANT TEMP SENSOR FAIL
Controller displays COOLANT TEMP SENSOR FAIL or ENGINE TEMP SENSOR ERROR; the unit may not start or may run with limited protection.
Coolant Temperature Sensor Circuit Fault
EMERGENCY STOP
The controller shows an EMERGENCY STOP or E-STOP ACTIVE alarm, and the generator will not start.
Emergency Stop Circuit Activated
ESTOP CIRCUIT OPEN
The controller indicates an ESTOP CIRCUIT OPEN or SAFETY CIRCUIT OPEN alarm; the generator will not crank.
Open Safety Chain / E-Stop Loop
FREQUENCY HIGH
Controller displays FREQUENCY HIGH or HZ HIGH while running.
High Output Frequency
FREQUENCY LOW
Controller displays FREQUENCY LOW or HZ LOW; lights may dim when large loads start.
Low Output Frequency
FUEL LEVEL SENSOR FAIL
Controller displays FUEL LEVEL SENSOR FAIL or FUEL SENDER ERROR; the fuel gauge reads empty or full regardless of the actual level.
Fuel Level Sender Circuit Fault
GEN OVERVOLT
The controller displays a GEN OVERVOLT or HIGH AC VOLTAGE alarm; the generator may shut down or open the main breaker.
Generator Overvoltage Condition
GEN UNDERVOLT
Controller shows GEN UNDERVOLT or LOW AC VOLTAGE; loads may drop out, or the transfer switch may not transfer.
Generator Undervoltage Condition
HIGH BATTERY VOLT
The controller displays a HIGH BATTERY VOLT or BATTERY OVERVOLT alarm.
Battery Overcharging Condition
HIGH COOLANT TEMP
Generator runs for several minutes, then shuts down with a HIGH COOLANT TEMP or ENGINE OVER TEMP alarm.
Engine Overheating Shutdown
LOW BATTERY VOLT
The controller shows a LOW BATTERY VOLT or BATTERY LOW alarm; the generator may fail to crank or crank slowly.
Low DC Battery Voltage
LOW COOLANT
Controller displays LOW COOLANT or COOLANT LEVEL alarm and generator will not run or shuts down after a short period.
Low Engine Coolant Level Shutdown
LOW FUEL
The controller shows a LOW FUEL or FUEL LEVEL alarm, and the generator will not start or shuts down under load.
Low Fuel Level / Fuel Starvation
LOW OIL LEVEL
Controller shows LOW OIL LEVEL (separate from pressure) and prevents starting.
Low Engine Oil Level Interlock
LOW OIL PRESSURE
Generator shuts down shortly after start and controller displays LOW OIL PRESSURE alarm.
Low Engine Oil Pressure Shutdown
MAINTENANCE DUE
Controller displays MAINTENANCE DUE or SERVICE DUE; generator still operates but with a reminder alarm.
Scheduled Maintenance Reminder
OIL PRESSURE SENSOR FAIL
Controller shows OIL PRESSURE SENSOR FAIL or OIL SENDER ERROR; it may inhibit starting or disable oil pressure protection.
Oil Pressure Sensor Circuit Fault
OVERCRANK
The generator attempts to start multiple times but fails to fire, and the controller displays an OVERCRANK or EXCESSIVE CRANKING alarm.
Failure to Start – Overcrank Lockout
OVERSPEED
The generator starts, then immediately shuts down with an OVERSPEED or ENGINE OVERSPEED alarm.
Engine Overspeed Protection Trip
PHASE IMBALANCE
Controller indicates PHASE IMBALANCE or VOLTAGE IMBALANCE; the generator remains running, but the alarm is active.
AC Output Phase Voltage Imbalance
STARTER FAULT
Controller shows STARTER FAULT or STARTER RELAY ERROR; the engine does not crank when a start is commanded.
Starter Circuit Failure
UNDERSPEED
The generator runs, but the controller displays an UNDERSPEED or LOW ENGINE SPEED alarm and may shut down under load.
Engine Underspeed / Loss of Speed Control
Symptom
A fuel odor is noticeable around the Gillette standby generator during or after operation.
External Fuel Leak or Venting
Symptom
Control panel display on the Gillette generator is blank or unreadable; generator does not respond to buttons.
Controller Power or Display Failure
Symptom
Corrosion and rust visible on battery terminals and nearby metal surfaces inside the generator enclosure.
Battery Corrosion and Enclosure Oxidation
Symptom
Generator cranks but will not start; no error code is displayed on the Gillette controller.
No-Start Condition Without Logged Fault
Symptom
Generator fails to start automatically during a utility power outage, but starts manually at the generator.
Automatic Start/Transfer Failure
Symptom
Generator runs but produces no AC output voltage; the controller shows normal run status with no fault.
No AC Output – Dead Alternator
Symptom
Generator runs for a short time then shuts down without any code; controller may simply show STOPPED.
Intermittent Shutdown Without Logged Fault
Symptom
Generator starts and runs during outage but building does not receive power; transfer switch does not transfer.
Failure to Transfer Load to Generator
Symptom
Generator starts but immediately stalls when a load is applied; no specific error code is shown.
Stalling Under Load
Symptom
Oil spots or puddles appear under the generator set.
External Engine Oil Leak
Symptom
Strong exhaust smell or visible exhaust fumes accumulate near the building when the generator runs.
Exhaust System Leak or Misrouting
Symptom
The generator is excessively noisy during operation compared to normal.
Abnormal Mechanical Noise
Symptom
The generator is running but lights flicker and voltage fluctuates under varying loads.
Unstable Voltage Regulation
Symptom
The generator vibrates excessively during operation, causing the enclosure to shake.
Excessive Vibration
Symptom
Visible coolant leak under or around the generator enclosure.
External Coolant Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| ATS COMM FAIL |
Controller shows ATS COMM FAIL or TRANSFER SWITCH COMM ERROR; automatic transfer may not occur.
|
Communication Loss with Automatic Transfer Switch | View Details |
| CHARGER FAIL |
Controller indicates CHARGER FAIL or BATTERY CHARGER ERROR; battery voltage slowly drops over days.
|
Battery Charger Failure | View Details |
| COOLANT TEMP SENSOR FAIL |
Controller displays COOLANT TEMP SENSOR FAIL or ENGINE TEMP SENSOR ERROR; the unit may not start or may run with limited protection.
|
Coolant Temperature Sensor Circuit Fault | View Details |
| EMERGENCY STOP |
The controller shows an EMERGENCY STOP or E-STOP ACTIVE alarm, and the generator will not start.
|
Emergency Stop Circuit Activated | View Details |
| ESTOP CIRCUIT OPEN |
The controller indicates an ESTOP CIRCUIT OPEN or SAFETY CIRCUIT OPEN alarm; the generator will not crank.
|
Open Safety Chain / E-Stop Loop | View Details |
| FREQUENCY HIGH |
Controller displays FREQUENCY HIGH or HZ HIGH while running.
|
High Output Frequency | View Details |
| FREQUENCY LOW |
Controller displays FREQUENCY LOW or HZ LOW; lights may dim when large loads start.
|
Low Output Frequency | View Details |
| FUEL LEVEL SENSOR FAIL |
Controller displays FUEL LEVEL SENSOR FAIL or FUEL SENDER ERROR; the fuel gauge reads empty or full regardless of the actual level.
|
Fuel Level Sender Circuit Fault | View Details |
| GEN OVERVOLT |
The controller displays a GEN OVERVOLT or HIGH AC VOLTAGE alarm; the generator may shut down or open the main breaker.
|
Generator Overvoltage Condition | View Details |
| GEN UNDERVOLT |
Controller shows GEN UNDERVOLT or LOW AC VOLTAGE; loads may drop out, or the transfer switch may not transfer.
|
Generator Undervoltage Condition | View Details |
| HIGH BATTERY VOLT |
The controller displays a HIGH BATTERY VOLT or BATTERY OVERVOLT alarm.
|
Battery Overcharging Condition | View Details |
| HIGH COOLANT TEMP |
Generator runs for several minutes, then shuts down with a HIGH COOLANT TEMP or ENGINE OVER TEMP alarm.
|
Engine Overheating Shutdown | View Details |
| LOW BATTERY VOLT |
The controller shows a LOW BATTERY VOLT or BATTERY LOW alarm; the generator may fail to crank or crank slowly.
|
Low DC Battery Voltage | View Details |
| LOW COOLANT |
Controller displays LOW COOLANT or COOLANT LEVEL alarm and generator will not run or shuts down after a short period.
|
Low Engine Coolant Level Shutdown | View Details |
| LOW FUEL |
The controller shows a LOW FUEL or FUEL LEVEL alarm, and the generator will not start or shuts down under load.
|
Low Fuel Level / Fuel Starvation | View Details |
| LOW OIL LEVEL |
Controller shows LOW OIL LEVEL (separate from pressure) and prevents starting.
|
Low Engine Oil Level Interlock | View Details |
| LOW OIL PRESSURE |
Generator shuts down shortly after start and controller displays LOW OIL PRESSURE alarm.
|
Low Engine Oil Pressure Shutdown | View Details |
| MAINTENANCE DUE |
Controller displays MAINTENANCE DUE or SERVICE DUE; generator still operates but with a reminder alarm.
|
Scheduled Maintenance Reminder | View Details |
| OIL PRESSURE SENSOR FAIL |
Controller shows OIL PRESSURE SENSOR FAIL or OIL SENDER ERROR; it may inhibit starting or disable oil pressure protection.
|
Oil Pressure Sensor Circuit Fault | View Details |
| OVERCRANK |
The generator attempts to start multiple times but fails to fire, and the controller displays an OVERCRANK or EXCESSIVE CRANKING alarm.
|
Failure to Start – Overcrank Lockout | View Details |
| OVERSPEED |
The generator starts, then immediately shuts down with an OVERSPEED or ENGINE OVERSPEED alarm.
|
Engine Overspeed Protection Trip | View Details |
| PHASE IMBALANCE |
Controller indicates PHASE IMBALANCE or VOLTAGE IMBALANCE; the generator remains running, but the alarm is active.
|
AC Output Phase Voltage Imbalance | View Details |
| STARTER FAULT |
Controller shows STARTER FAULT or STARTER RELAY ERROR; the engine does not crank when a start is commanded.
|
Starter Circuit Failure | View Details |
| UNDERSPEED |
The generator runs, but the controller displays an UNDERSPEED or LOW ENGINE SPEED alarm and may shut down under load.
|
Engine Underspeed / Loss of Speed Control | View Details |
| – |
A fuel odor is noticeable around the Gillette standby generator during or after operation.
|
External Fuel Leak or Venting | View Details |
| – |
Control panel display on the Gillette generator is blank or unreadable; generator does not respond to buttons.
|
Controller Power or Display Failure | View Details |
| – |
Corrosion and rust visible on battery terminals and nearby metal surfaces inside the generator enclosure.
|
Battery Corrosion and Enclosure Oxidation | View Details |
| – |
Generator cranks but will not start; no error code is displayed on the Gillette controller.
|
No-Start Condition Without Logged Fault | View Details |
| – |
Generator fails to start automatically during a utility power outage, but starts manually at the generator.
|
Automatic Start/Transfer Failure | View Details |
| – |
Generator runs but produces no AC output voltage; the controller shows normal run status with no fault.
|
No AC Output – Dead Alternator | View Details |
| – |
Generator runs for a short time then shuts down without any code; controller may simply show STOPPED.
|
Intermittent Shutdown Without Logged Fault | View Details |
| – |
Generator starts and runs during outage but building does not receive power; transfer switch does not transfer.
|
Failure to Transfer Load to Generator | View Details |
| – |
Generator starts but immediately stalls when a load is applied; no specific error code is shown.
|
Stalling Under Load | View Details |
| – |
Oil spots or puddles appear under the generator set.
|
External Engine Oil Leak | View Details |
| – |
Strong exhaust smell or visible exhaust fumes accumulate near the building when the generator runs.
|
Exhaust System Leak or Misrouting | View Details |
| – |
The generator is excessively noisy during operation compared to normal.
|
Abnormal Mechanical Noise | View Details |
| – |
The generator is running but lights flicker and voltage fluctuates under varying loads.
|
Unstable Voltage Regulation | View Details |
| – |
The generator vibrates excessively during operation, causing the enclosure to shake.
|
Excessive Vibration | View Details |
| – |
Visible coolant leak under or around the generator enclosure.
|
External Coolant Leak | View Details |
No matching codes found
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