MTU Onsite Energy
MTU Onsite Energy 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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F01
Controller displays F01 – Emergency stop active, generator will not crank or start
Emergency Stop Circuit Active
F02
Controller displays F02 – Overspeed shutdown immediately after start attempt
Engine Overspeed Protection Trip
F03
Controller displays F03 – Underspeed shutdown during start or under load
Engine Underspeed / Loss of Speed Control
F04
Controller displays F04 – Low oil pressure shutdown shortly after start
Low Lube Oil Pressure Protection Trip
F05
Controller displays F05 – High coolant temperature shutdown during operation
Engine Overtemperature Protection Trip
F06
Controller displays F06 – Low coolant temperature alarm, generator will not accept load
Engine Coolant Below Minimum Operating Temperature
F07
Controller displays F07 – Low fuel level alarm, generator inhibited from automatic start
Low Fuel Level Protection
F08
Controller displays F08 – Battery voltage low, start inhibited or slow cranking
Low DC Start Battery Voltage
F09
Controller displays F09 – Battery voltage high, charger fault
High DC Battery Voltage / Overcharge
F10
Controller displays F10 – Generator overvoltage alarm/shutdown
Generator Output Overvoltage
F11
Controller displays F11 – Generator undervoltage alarm/shutdown
Generator Output Undervoltage
F12
Controller displays F12 – Overfrequency alarm/shutdown
Generator Overfrequency
F13
Controller displays F13 – Underfrequency alarm/shutdown
Generator Underfrequency
F14
Controller displays F14 – Phase sequence / rotation error
Incorrect Phase Rotation or Phase Sequence Detection
F15
Controller displays F15 – Earth fault / ground fault alarm
Generator Ground Fault Detection
F16
Controller displays F16 – Oil temperature high alarm/shutdown
High Engine Oil Temperature
F17
Controller displays F17 – Intake air temperature high alarm
High Intake Air Temperature
F18
Controller displays F18 – Exhaust temperature high alarm/shutdown
High Exhaust Gas Temperature
F19
Controller displays F19 – Start failure after maximum crank attempts
Failure to Start
F20
Controller displays F20 – Stop failure, engine continues running after stop command
Failure to Stop
F21
Controller displays F21 – CAN bus communication error with engine ECU
CAN Communication Loss
F22
Controller displays F22 – Modbus / remote communication fault
Remote Communication Failure
F23
Controller displays F23 – Sensor supply voltage fault
Analog Sensor Supply Failure
F24
Controller displays F24 – Air filter restriction alarm
High Intake Air Filter Restriction
F25
Controller displays F25 – Fuel filter restriction alarm
High Fuel Filter Differential Pressure
F26
Controller displays F26 – Coolant level low alarm
Low Coolant Level Detection
F27
Controller displays F27 – Crank disconnect failure, starter remains engaged
Starter Crank Release Failure
F28
Controller displays F28 – Emergency stop circuit open (remote E-stop)
Remote Emergency Stop Circuit Open
F29
Controller displays F29 – Oil level low alarm (separate from pressure)
Low Engine Oil Level Detection
F30
Controller displays F30 – Generator bearing temperature high alarm
High Generator Bearing Temperature
Symptom
Automatic transfer switch does not transfer to generator during utility outage, but generator runs
ATS Fails to Transfer on Generator Available
Symptom
Black smoke from exhaust under load, generator frequency and voltage sagging
Overfueling / Air Starvation
Symptom
Blue smoke from exhaust and rising engine oil consumption
Oil Burning in Combustion Chambers
Symptom
Control panel dead, no display or indicator lights, generator will not respond
Control Power Loss
Symptom
Coolant puddle under generator set, but no coolant level alarm yet
External Coolant Leak
Symptom
Excessive white smoke from exhaust during startup and light load
Incomplete Combustion / Unburned Fuel
Symptom
Generator cranks but will not start, no error code displayed
No Start Without Logged Fault
Symptom
Generator frequency drifts or hunts up and down with relatively constant load
Governor Hunting / Unstable Speed Control
Symptom
Generator output voltage fluctuates or is unstable under steady load, no AVR fault code
Voltage Instability
Symptom
Generator runs in manual but will not start in automatic mode
Automatic Start Inhibit
Symptom
Generator set vibrates excessively during operation, especially at certain loads
Excessive Mechanical Vibration
Symptom
Generator starts and runs but main circuit breaker does not close to supply load
Generator Breaker Fails to Close
Symptom
Generator starts but immediately stalls when load is applied, no specific code
Load-Induced Engine Stall
Symptom
Loud knocking or metallic noise from engine under load
Abnormal Combustion or Mechanical Knock
Symptom
Strong diesel odor and visible exhaust fumes accumulating in generator room
Poor Exhaust Ventilation / Exhaust Leak
Symptom
Visible fuel leak from base tank or fuel lines under the MTU standby generator
External Fuel System Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| F01 |
Controller displays F01 – Emergency stop active, generator will not crank or start
|
Emergency Stop Circuit Active | View Details |
| F02 |
Controller displays F02 – Overspeed shutdown immediately after start attempt
|
Engine Overspeed Protection Trip | View Details |
| F03 |
Controller displays F03 – Underspeed shutdown during start or under load
|
Engine Underspeed / Loss of Speed Control | View Details |
| F04 |
Controller displays F04 – Low oil pressure shutdown shortly after start
|
Low Lube Oil Pressure Protection Trip | View Details |
| F05 |
Controller displays F05 – High coolant temperature shutdown during operation
|
Engine Overtemperature Protection Trip | View Details |
| F06 |
Controller displays F06 – Low coolant temperature alarm, generator will not accept load
|
Engine Coolant Below Minimum Operating Temperature | View Details |
| F07 |
Controller displays F07 – Low fuel level alarm, generator inhibited from automatic start
|
Low Fuel Level Protection | View Details |
| F08 |
Controller displays F08 – Battery voltage low, start inhibited or slow cranking
|
Low DC Start Battery Voltage | View Details |
| F09 |
Controller displays F09 – Battery voltage high, charger fault
|
High DC Battery Voltage / Overcharge | View Details |
| F10 |
Controller displays F10 – Generator overvoltage alarm/shutdown
|
Generator Output Overvoltage | View Details |
| F11 |
Controller displays F11 – Generator undervoltage alarm/shutdown
|
Generator Output Undervoltage | View Details |
| F12 |
Controller displays F12 – Overfrequency alarm/shutdown
|
Generator Overfrequency | View Details |
| F13 |
Controller displays F13 – Underfrequency alarm/shutdown
|
Generator Underfrequency | View Details |
| F14 |
Controller displays F14 – Phase sequence / rotation error
|
Incorrect Phase Rotation or Phase Sequence Detection | View Details |
| F15 |
Controller displays F15 – Earth fault / ground fault alarm
|
Generator Ground Fault Detection | View Details |
| F16 |
Controller displays F16 – Oil temperature high alarm/shutdown
|
High Engine Oil Temperature | View Details |
| F17 |
Controller displays F17 – Intake air temperature high alarm
|
High Intake Air Temperature | View Details |
| F18 |
Controller displays F18 – Exhaust temperature high alarm/shutdown
|
High Exhaust Gas Temperature | View Details |
| F19 |
Controller displays F19 – Start failure after maximum crank attempts
|
Failure to Start | View Details |
| F20 |
Controller displays F20 – Stop failure, engine continues running after stop command
|
Failure to Stop | View Details |
| F21 |
Controller displays F21 – CAN bus communication error with engine ECU
|
CAN Communication Loss | View Details |
| F22 |
Controller displays F22 – Modbus / remote communication fault
|
Remote Communication Failure | View Details |
| F23 |
Controller displays F23 – Sensor supply voltage fault
|
Analog Sensor Supply Failure | View Details |
| F24 |
Controller displays F24 – Air filter restriction alarm
|
High Intake Air Filter Restriction | View Details |
| F25 |
Controller displays F25 – Fuel filter restriction alarm
|
High Fuel Filter Differential Pressure | View Details |
| F26 |
Controller displays F26 – Coolant level low alarm
|
Low Coolant Level Detection | View Details |
| F27 |
Controller displays F27 – Crank disconnect failure, starter remains engaged
|
Starter Crank Release Failure | View Details |
| F28 |
Controller displays F28 – Emergency stop circuit open (remote E-stop)
|
Remote Emergency Stop Circuit Open | View Details |
| F29 |
Controller displays F29 – Oil level low alarm (separate from pressure)
|
Low Engine Oil Level Detection | View Details |
| F30 |
Controller displays F30 – Generator bearing temperature high alarm
|
High Generator Bearing Temperature | View Details |
| – |
Automatic transfer switch does not transfer to generator during utility outage, but generator runs
|
ATS Fails to Transfer on Generator Available | View Details |
| – |
Black smoke from exhaust under load, generator frequency and voltage sagging
|
Overfueling / Air Starvation | View Details |
| – |
Blue smoke from exhaust and rising engine oil consumption
|
Oil Burning in Combustion Chambers | View Details |
| – |
Control panel dead, no display or indicator lights, generator will not respond
|
Control Power Loss | View Details |
| – |
Coolant puddle under generator set, but no coolant level alarm yet
|
External Coolant Leak | View Details |
| – |
Excessive white smoke from exhaust during startup and light load
|
Incomplete Combustion / Unburned Fuel | View Details |
| – |
Generator cranks but will not start, no error code displayed
|
No Start Without Logged Fault | View Details |
| – |
Generator frequency drifts or hunts up and down with relatively constant load
|
Governor Hunting / Unstable Speed Control | View Details |
| – |
Generator output voltage fluctuates or is unstable under steady load, no AVR fault code
|
Voltage Instability | View Details |
| – |
Generator runs in manual but will not start in automatic mode
|
Automatic Start Inhibit | View Details |
| – |
Generator set vibrates excessively during operation, especially at certain loads
|
Excessive Mechanical Vibration | View Details |
| – |
Generator starts and runs but main circuit breaker does not close to supply load
|
Generator Breaker Fails to Close | View Details |
| – |
Generator starts but immediately stalls when load is applied, no specific code
|
Load-Induced Engine Stall | View Details |
| – |
Loud knocking or metallic noise from engine under load
|
Abnormal Combustion or Mechanical Knock | View Details |
| – |
Strong diesel odor and visible exhaust fumes accumulating in generator room
|
Poor Exhaust Ventilation / Exhaust Leak | View Details |
| – |
Visible fuel leak from base tank or fuel lines under the MTU standby generator
|
External Fuel System Leak | View Details |
No matching codes found
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