Yamaha
Yamaha 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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E01
Generator will not start and control panel displays E01 immediately after crank attempt.
Low Oil Pressure Shutdown / Lockout
E02
Generator cranks but shuts down within a few seconds and displays E02 on the Yamaha controller.
High Engine Temperature / Overheat Shutdown
E03
Generator attempts to start but stops and shows E03 on the display.
Overspeed Protection Trip
E04
Generator shuts down during run and displays E04 on the Yamaha standby controller.
Underspeed / Underfrequency Fault
E05
Generator will not start and the display shows E05 after several crank attempts.
No Start / Failed to Start
E06
Generator shuts down shortly after starting and displays E06.
Low Fuel Level / Fuel Supply Fault
E07
Generator display shows E07 and the unit will not crank.
Emergency Stop Activated / Remote Stop Circuit Open
E08
Generator display shows E08 and the unit will not start in AUTO mode.
Low Battery Voltage Alarm / Battery Charger Fault
E09
Generator shuts down and displays E09 during operation.
High Battery Voltage / Charging System Overvoltage
E10
Generator display shows E10 and the unit will not start.
Control Board Communication Error
E11
Generator shuts down and shows E11 after running under load.
AC Overvoltage Protection
E12
Generator shuts down and displays E12 during operation.
AC Undervoltage / Loss of Excitation
E13
Generator display shows E13 and the engine will not crank.
Starter Lockout / Crank Inhibit
E14
Generator shuts down and displays E14 shortly after starting.
Exhaust Temperature High / Exhaust Overheat
E15
Generator display shows E15 and the unit shuts down intermittently.
Intake Air Temperature Sensor Fault
E16
Generator will not start and shows E16 on the controller.
Engine Coolant Level Low (Liquid-Cooled Models)
E17
Generator shuts down and displays E17 during operation.
Fuel Pressure Low (Gaseous-Fueled Models)
E18
Generator display shows E18 and the engine runs roughly or stalls.
Oxygen Sensor / Lambda Sensor Fault (Emission-Controlled Models)
E19
Generator shuts down and displays E19 shortly after starting.
Engine Knock / Detonation Detected
E20
Generator display shows E20 and the unit will not start in AUTO mode.
Transfer Switch Communication Fault
Symptom
Control panel display is blank or very dim, but the generator can still be started manually at the engine.
Display Power / Backlight Failure
Symptom
Generator cranks but will not start; no error code displayed on Yamaha controller.
Fuel Delivery Failure (No Code)
Symptom
Generator emits blue smoke from the exhaust and consumes engine oil.
Oil Burning / Worn Engine Components
Symptom
Generator emits visible black smoke from the exhaust during operation.
Rich Fuel Mixture / Incomplete Combustion
Symptom
Generator emits white smoke or steam from the exhaust, especially on startup.
Coolant or Unburned Fuel in Exhaust
Symptom
Generator enclosure is very hot to the touch and internal components show signs of heat stress, but no overtemp code is present.
Inadequate Ventilation / Cooling Airflow Restriction
Symptom
Generator fails to start automatically during a utility outage, but starts normally in MANUAL mode.
Auto Start Signal / ATS Control Failure
Symptom
Generator is excessively noisy during operation compared to normal, with rattling or metallic sounds.
Loose Mounting / Exhaust or Engine Hardware
Symptom
Generator randomly shuts down after running for some time, with no error code stored.
Intermittent Sensor or Wiring Fault
Symptom
Generator runs but produces no AC output; controller shows normal run status with no code.
Open Main Breaker / Loose Output Connections
Symptom
Generator runs but the battery repeatedly goes dead between exercise cycles.
Battery Not Charging During Operation
Symptom
Generator runs its weekly exercise cycle but does not pick up any load during the test.
Exercise Mode Configured as No-Load Test
Symptom
Generator starts and runs but shuts down when large loads (e.g., HVAC) start, without logging a specific code.
Overload / Voltage Sag Under Motor Starting
Symptom
Generator starts and runs during outages but the transfer switch does not transfer load to the generator.
Transfer Switch Power Transfer Failure
Symptom
Generator starts but immediately surges, hunts, or stalls under light load with no error code.
Carburetor / Throttle Body Contamination
Symptom
Generator vibrates excessively, causing the enclosure to shake and nearby structures to rattle.
Imbalanced Rotating Assembly / Mounting Issue
Symptom
Strong fuel smell around the Yamaha standby generator during or after operation.
Fuel Leak / Venting Issue
Symptom
Visible oil leak under the generator set or oil pooling in the base pan.
Engine Lubrication System Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start and control panel displays E01 immediately after crank attempt.
|
Low Oil Pressure Shutdown / Lockout | View Details |
| E02 |
Generator cranks but shuts down within a few seconds and displays E02 on the Yamaha controller.
|
High Engine Temperature / Overheat Shutdown | View Details |
| E03 |
Generator attempts to start but stops and shows E03 on the display.
|
Overspeed Protection Trip | View Details |
| E04 |
Generator shuts down during run and displays E04 on the Yamaha standby controller.
|
Underspeed / Underfrequency Fault | View Details |
| E05 |
Generator will not start and the display shows E05 after several crank attempts.
|
No Start / Failed to Start | View Details |
| E06 |
Generator shuts down shortly after starting and displays E06.
|
Low Fuel Level / Fuel Supply Fault | View Details |
| E07 |
Generator display shows E07 and the unit will not crank.
|
Emergency Stop Activated / Remote Stop Circuit Open | View Details |
| E08 |
Generator display shows E08 and the unit will not start in AUTO mode.
|
Low Battery Voltage Alarm / Battery Charger Fault | View Details |
| E09 |
Generator shuts down and displays E09 during operation.
|
High Battery Voltage / Charging System Overvoltage | View Details |
| E10 |
Generator display shows E10 and the unit will not start.
|
Control Board Communication Error | View Details |
| E11 |
Generator shuts down and shows E11 after running under load.
|
AC Overvoltage Protection | View Details |
| E12 |
Generator shuts down and displays E12 during operation.
|
AC Undervoltage / Loss of Excitation | View Details |
| E13 |
Generator display shows E13 and the engine will not crank.
|
Starter Lockout / Crank Inhibit | View Details |
| E14 |
Generator shuts down and displays E14 shortly after starting.
|
Exhaust Temperature High / Exhaust Overheat | View Details |
| E15 |
Generator display shows E15 and the unit shuts down intermittently.
|
Intake Air Temperature Sensor Fault | View Details |
| E16 |
Generator will not start and shows E16 on the controller.
|
Engine Coolant Level Low (Liquid-Cooled Models) | View Details |
| E17 |
Generator shuts down and displays E17 during operation.
|
Fuel Pressure Low (Gaseous-Fueled Models) | View Details |
| E18 |
Generator display shows E18 and the engine runs roughly or stalls.
|
Oxygen Sensor / Lambda Sensor Fault (Emission-Controlled Models) | View Details |
| E19 |
Generator shuts down and displays E19 shortly after starting.
|
Engine Knock / Detonation Detected | View Details |
| E20 |
Generator display shows E20 and the unit will not start in AUTO mode.
|
Transfer Switch Communication Fault | View Details |
| – |
Control panel display is blank or very dim, but the generator can still be started manually at the engine.
|
Display Power / Backlight Failure | View Details |
| – |
Generator cranks but will not start; no error code displayed on Yamaha controller.
|
Fuel Delivery Failure (No Code) | View Details |
| – |
Generator emits blue smoke from the exhaust and consumes engine oil.
|
Oil Burning / Worn Engine Components | View Details |
| – |
Generator emits visible black smoke from the exhaust during operation.
|
Rich Fuel Mixture / Incomplete Combustion | View Details |
| – |
Generator emits white smoke or steam from the exhaust, especially on startup.
|
Coolant or Unburned Fuel in Exhaust | View Details |
| – |
Generator enclosure is very hot to the touch and internal components show signs of heat stress, but no overtemp code is present.
|
Inadequate Ventilation / Cooling Airflow Restriction | View Details |
| – |
Generator fails to start automatically during a utility outage, but starts normally in MANUAL mode.
|
Auto Start Signal / ATS Control Failure | View Details |
| – |
Generator is excessively noisy during operation compared to normal, with rattling or metallic sounds.
|
Loose Mounting / Exhaust or Engine Hardware | View Details |
| – |
Generator randomly shuts down after running for some time, with no error code stored.
|
Intermittent Sensor or Wiring Fault | View Details |
| – |
Generator runs but produces no AC output; controller shows normal run status with no code.
|
Open Main Breaker / Loose Output Connections | View Details |
| – |
Generator runs but the battery repeatedly goes dead between exercise cycles.
|
Battery Not Charging During Operation | View Details |
| – |
Generator runs its weekly exercise cycle but does not pick up any load during the test.
|
Exercise Mode Configured as No-Load Test | View Details |
| – |
Generator starts and runs but shuts down when large loads (e.g., HVAC) start, without logging a specific code.
|
Overload / Voltage Sag Under Motor Starting | View Details |
| – |
Generator starts and runs during outages but the transfer switch does not transfer load to the generator.
|
Transfer Switch Power Transfer Failure | View Details |
| – |
Generator starts but immediately surges, hunts, or stalls under light load with no error code.
|
Carburetor / Throttle Body Contamination | View Details |
| – |
Generator vibrates excessively, causing the enclosure to shake and nearby structures to rattle.
|
Imbalanced Rotating Assembly / Mounting Issue | View Details |
| – |
Strong fuel smell around the Yamaha standby generator during or after operation.
|
Fuel Leak / Venting Issue | View Details |
| – |
Visible oil leak under the generator set or oil pooling in the base pan.
|
Engine Lubrication System Leak | View Details |
No matching codes found
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