The most common problem to baffle Onan generator owners is the dreaded "Starts and cranks over but will not continue to run!" symptom. This is by far the most common problem I run into daily. Let me start by saying this, it's normally not the control board. This symptom means that the control is doing its job. Do not just buy a control because your local expert said so. They are likely wrong.
The controls on the Onan generator are designed to look for AC voltage and oil pressure. If you have the symptom above, you are missing AC voltage or oil pressure. Let me be clear, there must be AC voltage and oil pressure present. Clear enough? One model is the exception to the rule, The Marquis. All other Onan generators follow this rule. So now you know where to start right? At least a better idea, right? No? It's cool, I get it. They are two things that are not always so straight forward when testing.
Here is where it gets tricky, there are so many different models of generators and all have different pin assignments that it is best to ask about your specific generator. I can always try to help and you may feel free to ask. I put a good bit of that info into troubleshoot guides but it still is vague and slightly confusing.
So just to recap, AC voltage and oil pressure are two things these generators need in order to get up and running, and stay running.
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