Generator Error Codes: What They Mean & How to Fix Them
When your generator displays an error code, it’s trying to tell you something. These codes help identify potential issues so you can address them before they become bigger problems.
Generator Error Codes
Knowledge is Power
Generators are built to provide reliable backup power, but occasional issues can arise. When they do, your generator will display an error code to help diagnose the problem.
Below, we’ve outlined common Kohler, Generac, and Cummins generator error codes, what they mean, and how to fix them.
If you’re unsure how to resolve an issue or your generator won’t start, Osburn Services is available 24/7 to help.
Generator Error Codes
Kohler Generator Error Codes
Kohler generators use a variety of codes to indicate maintenance needs or malfunctions. Here are some of the most common ones:
- W260 (Low Battery Voltage) – The generator battery may be weak or failing. Try charging or replacing the battery.
- W280 (Charger AC Failure) – The battery charger isn’t getting power. Check the outlet or wiring.
- U0300 (Controller Internal Fault) – There may be an issue with the generator’s control board. A professional inspection is recommended.
- UU125 (Low Oil Pressure) – The oil level is too low or the oil sensor is faulty. Check the oil and top it off if needed.
- UU190 (Overcrank Fault) – The generator tried to start multiple times but failed. Check the fuel supply and battery.
- UU110 (Overvoltage Fault) – The generator is producing too much voltage, which could indicate a control issue.
What to Do for Kohler Error Codes:
Generator Error Codes
Generac Error Codes
Generac generators display error codes on the control panel or mobile app. Here’s what they mean:
- 1100 (Overcrank) – The generator couldn’t start after multiple attempts. Check the fuel level and battery.
- 1200 (Overspeed) – The engine is running too fast, possibly due to a sensor issue.
- 1300 (Low Oil Pressure) – The oil level is too low or there’s an issue with the oil pump.
- 1505 / 1515 (RPM Sense Loss) – The generator shut down because it couldn’t detect engine speed. This could be due to a bad sensor or fuel issue.
- 1600 (Low Voltage Warning) – The generator is not producing enough power, often due to load issues.
- 1900 (Charger Warning) – The battery charger isn’t working properly, which could lead to startup failures.
What to Do for Generac Error Codes:
Generator Error Codes
Cummins Generator Error Codes
Cummins generators also provide error codes to indicate system faults. Here are some common ones:
- Fault Code 143 (Overcrank) – The generator failed to start. Check fuel levels and battery connections.
- Fault Code 277 (Low Oil Pressure) – The oil level is too low or there’s an issue with the oil sensor.
- Fault Code 375 (High Coolant Temperature) – The generator is overheating, possibly due to a cooling system issue.
- Fault Code 441 (Battery Voltage Low) – The battery is weak or not charging properly.
- Fault Code 629 (Under Voltage) – The generator is producing less voltage than required, often due to a control issue.
What to Do for Cummins Error Codes:
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Generator Error Codes
Don't Wait for the Storm- Be Ready When it Hits
If your generator is showing an error code and you’re not sure what to do, don’t wait until a power outage to fix it. Our team at Osburn Services is available 24/7 to troubleshoot and repair all major generator brands, including Kohler, Generac, and Cummins.
In memory of Chris Leonard — a valued teammate, a trusted friend, and a part of the Osburn family.
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