Ryobi
Ryobi 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 the controller display shows E01 immediately after a start attempt.
Low Oil Shutdown / Oil Pressure Fault
E02
Generator cranks but does not start, then stops and displays E02 on the Ryobi controller.
Overcrank / Failed Start Fault
E03
Generator starts briefly, then shuts down and displays E03 on the control panel.
Overspeed / Engine RPM High Fault
E04
Ryobi standby generator shuts down during operation and displays E04 on the controller.
Underspeed / Engine RPM Low Fault
E05
Generator shuts down and displays E05; controller may indicate high engine temperature.
High Engine Temperature / Overheat Fault
E06
Controller shows E06 and the generator will not start or shuts down shortly after starting.
Low Battery Voltage / Battery Fault
E07
Ryobi controller displays E07 and prevents generator operation.
Generator Overvoltage Fault
E08
Generator starts but no power is delivered to the house; controller shows E08.
Generator Undervoltage / No Output Fault
E09
Controller displays E09 and prevents automatic operation of the Ryobi standby generator.
Frequency Out of Range Fault
E10
Ryobi controller shows E10 and the generator will not start in AUTO mode.
Emergency Stop / E‑Stop Active Fault
E11
Controller displays E11 and the generator will not crank.
Starter Circuit Fault
E12
Ryobi standby generator shuts down and displays E12 during operation.
Low Oil Pressure While Running
E13
Controller shows E13 and the generator will not run in AUTO mode.
High Coolant Temperature (Liquid‑Cooled Models)
E14
Ryobi controller displays E14 and the generator will not start.
Intake Air Temperature / Sensor Fault
E15
Controller shows E15 and prevents generator operation.
Exhaust Temperature / Exhaust Restriction Fault
E16
Ryobi standby generator controller displays E16 and the unit will not transfer load.
Transfer Switch Communication Fault
E17
Controller shows E17 and logs a fuel supply error; generator may stall under load.
Fuel Pressure / Fuel Supply Fault
E18
Ryobi controller displays E18 and the generator shuts down unexpectedly.
Ignition Coil / Ignition Fault
E19
Controller shows E19 and logs a sensor error; generator may not start.
Engine Speed / RPM Sensor Fault
E20
Ryobi standby generator controller displays E20 and the unit will not enter AUTO mode.
Controller Internal Fault
Symptom
Control panel display is blank or unreadable, but the generator may still run.
Display / Control Panel Power Issue
Symptom
Generator cranks slowly or not at all, but no error code is displayed on the Ryobi controller.
Weak or Discharged Starting Battery
Symptom
Generator enclosure is wet inside or shows signs of rust and water staining.
Water Ingress into Enclosure
Symptom
Generator enclosure or nearby ground shows signs of oil leakage.
External Engine Oil Leak
Symptom
Generator fails to start automatically during a utility outage, but starts manually from the control panel.
AUTO Start / Sensing Circuit Issue
Symptom
Generator is excessively loud or has a sharp exhaust bark compared to normal operation.
Exhaust System Leak or Muffler Failure
Symptom
Generator oil level appears normal but the low oil light intermittently flickers during operation.
Intermittent Low Oil Sensor Signal
Symptom
Generator runs but emits visible black smoke from the exhaust.
Rich Fuel Mixture / Incomplete Combustion
Symptom
Generator runs but emits white or bluish smoke, especially on startup.
Oil Burning / Valve Seal or Ring Wear
Symptom
Generator runs but lights flicker and sensitive electronics behave erratically when on generator power.
Unstable Voltage Regulation
Symptom
Generator runs but produces no power to the house and no specific error code is shown.
Main Breaker Open or Transfer Switch Not Engaging
Symptom
Generator runs but there is a noticeable burning plastic or electrical smell from the enclosure.
Overheating Electrical Component
Symptom
Generator runs its weekly exercise cycle but does not transfer load to the house.
Exercise Mode Configuration / No‑Load Test
Symptom
Generator starts and runs under load but then trips its main breaker after several minutes.
Overcurrent / Overload Condition
Symptom
Generator starts and stops repeatedly without transferring load, no code displayed.
Unstable Engine Operation / Hunting
Symptom
Generator starts but shuts down when large loads like air conditioners attempt to start.
Load Step / Starting Surge Overload
Symptom
Generator vibrates excessively during operation, causing rattling noises from the enclosure.
Excessive Vibration / Mounting Isolation Failure
Symptom
Noticeable fuel smell around the Ryobi standby generator enclosure, even when not running.
Fuel Leak at Generator
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| E01 |
Generator will not start and the controller display shows E01 immediately after a start attempt.
|
Low Oil Shutdown / Oil Pressure Fault | View Details |
| E02 |
Generator cranks but does not start, then stops and displays E02 on the Ryobi controller.
|
Overcrank / Failed Start Fault | View Details |
| E03 |
Generator starts briefly, then shuts down and displays E03 on the control panel.
|
Overspeed / Engine RPM High Fault | View Details |
| E04 |
Ryobi standby generator shuts down during operation and displays E04 on the controller.
|
Underspeed / Engine RPM Low Fault | View Details |
| E05 |
Generator shuts down and displays E05; controller may indicate high engine temperature.
|
High Engine Temperature / Overheat Fault | View Details |
| E06 |
Controller shows E06 and the generator will not start or shuts down shortly after starting.
|
Low Battery Voltage / Battery Fault | View Details |
| E07 |
Ryobi controller displays E07 and prevents generator operation.
|
Generator Overvoltage Fault | View Details |
| E08 |
Generator starts but no power is delivered to the house; controller shows E08.
|
Generator Undervoltage / No Output Fault | View Details |
| E09 |
Controller displays E09 and prevents automatic operation of the Ryobi standby generator.
|
Frequency Out of Range Fault | View Details |
| E10 |
Ryobi controller shows E10 and the generator will not start in AUTO mode.
|
Emergency Stop / E‑Stop Active Fault | View Details |
| E11 |
Controller displays E11 and the generator will not crank.
|
Starter Circuit Fault | View Details |
| E12 |
Ryobi standby generator shuts down and displays E12 during operation.
|
Low Oil Pressure While Running | View Details |
| E13 |
Controller shows E13 and the generator will not run in AUTO mode.
|
High Coolant Temperature (Liquid‑Cooled Models) | View Details |
| E14 |
Ryobi controller displays E14 and the generator will not start.
|
Intake Air Temperature / Sensor Fault | View Details |
| E15 |
Controller shows E15 and prevents generator operation.
|
Exhaust Temperature / Exhaust Restriction Fault | View Details |
| E16 |
Ryobi standby generator controller displays E16 and the unit will not transfer load.
|
Transfer Switch Communication Fault | View Details |
| E17 |
Controller shows E17 and logs a fuel supply error; generator may stall under load.
|
Fuel Pressure / Fuel Supply Fault | View Details |
| E18 |
Ryobi controller displays E18 and the generator shuts down unexpectedly.
|
Ignition Coil / Ignition Fault | View Details |
| E19 |
Controller shows E19 and logs a sensor error; generator may not start.
|
Engine Speed / RPM Sensor Fault | View Details |
| E20 |
Ryobi standby generator controller displays E20 and the unit will not enter AUTO mode.
|
Controller Internal Fault | View Details |
| – |
Control panel display is blank or unreadable, but the generator may still run.
|
Display / Control Panel Power Issue | View Details |
| – |
Generator cranks slowly or not at all, but no error code is displayed on the Ryobi controller.
|
Weak or Discharged Starting Battery | View Details |
| – |
Generator enclosure is wet inside or shows signs of rust and water staining.
|
Water Ingress into Enclosure | View Details |
| – |
Generator enclosure or nearby ground shows signs of oil leakage.
|
External Engine Oil Leak | View Details |
| – |
Generator fails to start automatically during a utility outage, but starts manually from the control panel.
|
AUTO Start / Sensing Circuit Issue | View Details |
| – |
Generator is excessively loud or has a sharp exhaust bark compared to normal operation.
|
Exhaust System Leak or Muffler Failure | View Details |
| – |
Generator oil level appears normal but the low oil light intermittently flickers during operation.
|
Intermittent Low Oil Sensor Signal | View Details |
| – |
Generator runs but emits visible black smoke from the exhaust.
|
Rich Fuel Mixture / Incomplete Combustion | View Details |
| – |
Generator runs but emits white or bluish smoke, especially on startup.
|
Oil Burning / Valve Seal or Ring Wear | View Details |
| – |
Generator runs but lights flicker and sensitive electronics behave erratically when on generator power.
|
Unstable Voltage Regulation | View Details |
| – |
Generator runs but produces no power to the house and no specific error code is shown.
|
Main Breaker Open or Transfer Switch Not Engaging | View Details |
| – |
Generator runs but there is a noticeable burning plastic or electrical smell from the enclosure.
|
Overheating Electrical Component | View Details |
| – |
Generator runs its weekly exercise cycle but does not transfer load to the house.
|
Exercise Mode Configuration / No‑Load Test | View Details |
| – |
Generator starts and runs under load but then trips its main breaker after several minutes.
|
Overcurrent / Overload Condition | View Details |
| – |
Generator starts and stops repeatedly without transferring load, no code displayed.
|
Unstable Engine Operation / Hunting | View Details |
| – |
Generator starts but shuts down when large loads like air conditioners attempt to start.
|
Load Step / Starting Surge Overload | View Details |
| – |
Generator vibrates excessively during operation, causing rattling noises from the enclosure.
|
Excessive Vibration / Mounting Isolation Failure | View Details |
| – |
Noticeable fuel smell around the Ryobi standby generator enclosure, even when not running.
|
Fuel Leak at Generator | View Details |
No matching codes found
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