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Onan 12.5 HD CAB Spec A - Code 12 Error

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Old 08-16-2016, 04:31:45 PM
Louie Montana Louie Montana is offline
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Location: Bozeman, Montana, USA
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Default Onan 12.5 HD CAB Spec A - Code 12 Error

This generator problem has me puzzled. The generator motor shut down, and a Code 12 "Over Voltage" was displayed. I re-started the generator, it ran for a few seconds and then shut down and again a Code 12. I measured the voltage at the customer connection block. The voltage between T-1 and T-2 was 120 until the generator kicked up, then it went up to 210. Between T-3 and T-4, the voltage was 0. The motor immediately shut down.

I think the generator saw not enough output so it compensated, then saw too much voltage on one leg and shut down. The continuity through the stater and rotor windings was good. Could this over-voltage on one leg and 0 voltage on the other be due to a defective control board? According to a generic generator manual, the quadrature should be checked. I did not measure or check the quadrature as I do not know what it is or how to test it. This generator has less than 500 hours on it. Can anyone out there give me guidance on where to look now?

Thank you in advance,
Louie M
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