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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14487
Experience:  Certified on Onan and Generac generators
19372534
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I have an Onan 4000 micro quiet generator it flashes three

Customer Question

I have an Onan 4000 micro quiet generator it flashes three times. Runs for few minutes then dies
JA: I'll do all I can to help. Tell me a bit more about what's going on so we can help you best.
Customer: I was using it and it died then wouldn't start. When it does start it runs for 2-3 minutes then dies. I replaced the carberator and fuel filter. The fuel pump is moving plenty of fuel. The oil is full but hasn't been changed for last 50 hours
JA: Is there anything else the Small Engine Technician should be aware of?
Customer: No
JA: OK. Got it. I'm sending you to a secure page on JustAnswer so you can place the $5 fully-refundable deposit now. While you're filling out that form, I'll tell the Small Engine Technician about your situation and then connect you two.
Submitted: 5 months ago.
Category: Small Engine
Expert:  Hank F. replied 5 months ago.

What is the actual model number of the genset?

What fault code are you getting?

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: 2 rapid flashes, 1 second pause, 5 rapid flashes 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.

Be very careful not to misread a first level fault code (single digit code) as a second level fault code (double digit code).
The way to tell the difference is by the length of the pauses.
There is a 1 second pause between digits of a second level code, and a 3 second pause between codes.
For example, if it is flashing 2 times, 1 second pause, flashing 2 times, 3 second pause and repeating, then this is a second level fault code of 22.
If it is flashing 2 times, 3 second pause, flashing 2 times, 3 second pause and repeating, then this is a first level fault code of 2.

What Fault Code are you getting?
.