This is a fine distinction, as there are several reasons why this situation can happen, sometimes it can happen even if your generator is producing a proper voltage in the neighborhood of 120V.īut, I’ll get to that in a moment, for now, let’s move to troubleshoot the cause of the fault code 12. The fault code 12 signifies that the control board is detecting that generator is either producing voltage between 138-150V continuously for longer than 3 minutes or above 150V when it will instantaneously shut down. When your generator starts displaying an error code, it can be a mildly frightening experience, Onan generators are built with very robust protection from malfunctioning, and most of the issues that can arise you can fix by yourself. The main appeal of RVing is the ability to take all the comforts of modern civilization out in the wild, and the crucial device that makes it possible is an electric generator. When you take your RV away from the conveniences of the campgrounds and shore power, the main source of electricity for it is the generator it has.Īny type of malfunction of the generator can simply ruin your RV trip. Reading the Fault Code on Onan Generator.What is Fault Code 12 on Onan Generator.So, how to fix fault code 12 on Onan generator? To solve the error code 12 on Onan generator, just check and follow the steps below: Thus, it is very important that it is in proper working order and supplies power reliably to your motorhome. When you are out there, dry camping, the only source of electricity for your RV and the appliances in it, will be your generator. This is not among the most common fault codes, and if you are inexperienced in the maintenance of Onan generators, it can be an anxiety-inducing event.įault code 12 can be caused by few potential issues, finding the correct one is the first step to fixing it. The fault code 12 on Onan generator, in the simplest terms, means that over-voltage, a state when the generator is producing too high voltage or the control board is erroneously detecting a too high voltage.
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