Why does my Onan diesel generator keep shutting off?
Emily Wilson
Updated on March 07, 2026
Why does my Onan diesel generator keep shutting off?
Check the Oil Level If the fuel supply is sufficient but your generator still starts and stops, check the generator’s oil level. Onan RV generators have a “low oil” shutoff that could cause a shutdown. As oil warms it thins out and this may cause it to fall below the proper level.
Why does my motorhome generator won’t stay running?
The Onan Marquis requires sufficient oil pressure to keep running, so carefully check the oil level. If it is correct, then it may be a faulty oil pressure switch, or it could also be stuck in the open position. The generator also requires enough AC voltage to keep it rotating.
How do you clear an Onan fault code?
How to Clear a Fault Code on Onan Generator
- Locate the primer button on the generator.
- Hold the primer button down for at least 30 seconds.
- Release the button and start the generator.
- Allow the generator to run for 15 minutes, to ensure that the code has cleared.
Can an RV generator overheat?
Diesel powered generators are known for their fuel efficiency, reliability and long life-span. However, that does not mean they do not have their fair share of problems. One such problem is the potential for overheating. Overheating can be caused by a low level of coolant, improper use or a problem with the generator.
What kind of oil does a Onan generator take?
Onan RV recommends changing the oil every 100 hours or once a year, whichever comes first. It only takes about 20 minutes and you will be good to go for the season. You will need a T30 torx bit, a 12mm socket, an oil pan, a funnel and 1.6 quarts of SAE30 or 15W-40 oil.
What to do if generator keeps shutting off?
In the case of overloading, most generators are programmed to shut down. This feature, home to newer models, saves your appliances from getting stressed when the system is being overloaded. A simple solution to this would be to reduce the load of the generator and to restart it.
What would cause a generator to shut off?
Oil levels that are too low can cause generator shutoff. Generators will still start with low oil, but newer models have a “low oil shutoff sensor” that will automatically kill the engine when oil levels are too low in order to prevent running of the generator with no oil.
What does 3 flashes mean on a Onan generator?
From the Onan manual: Three blinks indicates a service fault. Press Stop once to cause the two-digit, second-level fault code to blink. ( Pressing Stop again will stop the blinking.)
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