Atlas Copco

Atlas Copco 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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E001
Generator will not start, controller shows E001 and immediately aborts cranking
Emergency Stop Active / Safety Chain Open
E002
Generator shuts down during run, controller displays E002 Low Oil Pressure
Low Oil Pressure Shutdown
E003
Generator stops and displays E003 High Engine Temperature on the Atlas Copco controller
High Coolant Temperature Shutdown
E004
Generator shuts down shortly after start, controller shows E004 Overspeed
Engine Overspeed Shutdown
E005
Controller displays E005 Underspeed and the generator trips off load
Engine Underspeed / Underfrequency Trip
E006
Atlas Copco controller shows E006 Low Fuel Level or Fuel Level Alarm, generator will not start in auto
Low Fuel Level Lockout
E007
Generator shuts down and displays E007 Low Coolant Level
Low Coolant Level Shutdown
E008
Controller indicates E008 Battery Voltage Low, generator fails to crank or cranks slowly
Low DC Battery Voltage Alarm
E009
Atlas Copco controller shows E009 Battery Voltage High
High DC Battery Voltage Alarm
E010
Generator fails to start, controller displays E010 Start Failure after several crank attempts
Start Failure / No Start Condition
E011
Controller shows E011 Phase Sequence Error when attempting to transfer load
Incorrect Phase Rotation / Phase Sequence Fault
E012
Atlas Copco controller indicates E012 Overvoltage and trips the generator breaker
Generator Overvoltage Protection Trip
E013
Controller shows E013 Undervoltage, generator breaker will not close
Generator Undervoltage Protection Trip
E014
Atlas Copco controller displays E014 Overcurrent / Overload and trips the generator breaker
Overcurrent / Overload Trip
E015
Controller shows E015 Earth Fault / Ground Fault, generator trips off load
Earth Fault Protection Trip
E016
Atlas Copco controller indicates E016 CAN Communication Error with engine ECU
CAN Bus Communication Fault
E017
Controller shows E017 Oil Temperature High, generator shuts down under load
High Oil Temperature Shutdown
E018
Atlas Copco controller displays E018 Air Filter Restriction / Intake Pressure High
Air Intake Restriction Alarm
E019
Controller shows E019 Fuel Water Level High / Water in Fuel
Water in Fuel Alarm
E020
Atlas Copco controller indicates E020 Service Due / Maintenance Alarm
Scheduled Maintenance Reminder
E021
Controller shows E021 Coolant Heater Failure / Engine Heater Fault
Engine Block Heater Fault
E022
Atlas Copco controller displays E022 Mains Failure Detection Fault
Mains Sensing / Utility Voltage Detection Fault
E023
Controller shows E023 Generator–Mains Sync Error during automatic transfer
Synchronization Failure
E024
Atlas Copco controller indicates E024 Glow Plug Fault (on equipped diesel engines)
Glow Plug Circuit Fault
E025
Controller shows E025 Crank Disconnect Fault, starter remains engaged too long or disengages too early
Crank Termination / Start Sequence Fault
E026
Atlas Copco controller displays E026 Oil Level Low (if equipped with level sensor)
Low Oil Level Alarm
E027
Controller shows E027 Exhaust Temperature High
High Exhaust Gas Temperature Alarm
E028
Atlas Copco controller indicates E028 Alternator Temperature High
Alternator Overtemperature Alarm
E029
Controller shows E029 ATS Feedback Fault / Breaker Position Mismatch
Breaker / ATS Position Feedback Error
E030
Atlas Copco controller displays E030 Sensor Supply Fault / 5V Reference Error
Sensor Supply Voltage Fault
Symptom
Automatic Transfer Switch (ATS) does not transfer to generator during mains failure, but generator runs
ATS Fails to Transfer to Generator
Symptom
Blue smoke from exhaust, especially under light load
Oil Burning
Symptom
Corrosion visible on battery terminals and nearby metal surfaces
Battery Terminal Corrosion
Symptom
Excessive black smoke from exhaust during operation
Rich Combustion / Overfueling
Symptom
Excessive white smoke from exhaust on startup that continues after warm‑up
Incomplete Combustion / Possible Coolant Ingress
Symptom
Generator battery repeatedly goes flat between test runs
Chronic Battery Discharge
Symptom
Generator coolant level drops over time with no visible external leaks
Unexplained Coolant Loss
Symptom
Generator cooling fan does not run or airflow through radiator seems weak
Cooling Fan / Airflow Fault
Symptom
Generator cranks normally but will not start, no error code displayed on Atlas Copco controller
No‑Start Condition Without Logged Fault
Symptom
Generator does not start automatically on mains failure, but starts manually from controller
Auto Start Function Failure
Symptom
Generator enclosure is excessively hot inside, even at moderate load
Poor Enclosure Ventilation
Symptom
Generator enclosure or base frame shows signs of oil leakage
External Engine Oil Leak
Symptom
Generator frequency is consistently low or high (e.g. 47–48 Hz or 52–53 Hz) at steady load
Incorrect Engine Speed / Frequency
Symptom
Generator output voltage fluctuates noticeably under steady load, lights flicker
Unstable Voltage Regulation
Symptom
Generator produces unusual loud knocking or metallic noise from engine
Abnormal Engine Knock
Symptom
Generator starts but immediately stalls when load is applied, no specific error code
Load‑Induced Stalling
Symptom
Generator vibrates excessively during operation, causing enclosure to rattle
Excessive Vibration
Symptom
Moisture or water found inside generator enclosure, signs of rust on components
Water Ingress / Condensation
Symptom
Strong diesel smell around generator even when not running
Fuel Vapor / Odor Issue
Symptom
Visible fuel leak under or around Atlas Copco standby generator enclosure
External Fuel Leak
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