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Ask Hank F. Your Own Question
Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 15008
Experience:  Certified on Onan and Generac generators
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can you help me with a code 37 on my onan 5000

Resolved Question:

can you help me with a code 37 on my onan 5000
Submitted: 6 years ago.
Category: Small Engine
Expert:  Hank F. replied 6 years ago.

Thank you for choosing Just Answer for the solution to your problem.
My name is XXXXX XXXXX I am going to assist you with this.


What is the full model number of your genset?


Customer: replied 6 years ago.
model # XXXXX
Expert:  Hank F. replied 6 years ago.

Code 37 is Invalid Set Configuration.


The controller senses the engine speed through a signal from the magnetos, as well as the frequency of the AC output.

It compares these 2 inputs as a ratio, and if the ratio falls out of spec, it shuts the set down and gives this signal.


1. The engine is running at the proper RPM, but the AC frequency is too high or too low, this code is set.

2. The AC frequency is correct, but the engine is running too slow or too fast, this code is set.


What needs to be done is to measure the frequency - a frequency meter is absolutely required for this - and then completely test the ignition system (spark plugs, spark plug wires, magnetos, controller connections).

If a problem is found, it needs to be corrected.

If no problem is found with either system, the controller is bad and must be replaced.

The controller is very expensive, about $500 as best I recall, so a thorough test is called for.


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