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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14440
Experience:  Certified on Onan and Generac generators
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My onan generator keeps shutting off after about 10 minutes

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My onan generator keeps shutting off after about 10 minutes of running our diesil pusher, what should I check for. It cuts off quickly.

Thank You


This is a microprocessor controlled set with self-diagnostic capabilities.

Let's obtain the trouble codes from the controller to help us.



Go to the genset and use the switch on the set itself.
Press 'Stop' 3 times within 5 seconds. The light in the switch will start flashing.
If the light flashes 3 times, pauses for 3 seconds, and flashes 3 more times, press and immediately release 'Stop' one more time.

This will put the controller into Fault Read Mode.

The light will flash (X) number of times, pause for 1 second, and flash for (X) number of times again. Count the flashes before and after the pause.

This will be the Fault Code.

Example: flash flash, 1 second pause, flash flash flash flash flash is a Fault Code 25.

There may be more than one Fault Code stored, so watch the light very carefully. If there is more than one code, it will display them all in order, and then start over again.

What Fault Code are you getting?


Customer: replied 6 years ago.
ours is flash2x stop pause flash 4x over and over again

Code 24 is Coolant Temperature Sender Fault.


You will need to remove the top cover of the genset.

The sender is located in the thermostat housing.

Make sure the wire is firmly connected to the sender.

If the wire is secure, you will need to replace the sender.


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