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Old 02-20-2008, 12:06 PM   #1
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We have an Apollo 1/2 time oven. The dealer just replaced the circuit board and now the microwave makes a loud humming noise when using generator power. It does not make the same noise while on 30 amp shore power. It does heat up, but is quite noisy. We are leaving for FMCA convention Friday AM and will be using the generator all next week. Will be gone a month so can't get it back to the dealer until we return.

Any ideas or things I can check?
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Old 02-20-2008, 12:06 PM   #2
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We have an Apollo 1/2 time oven. The dealer just replaced the circuit board and now the microwave makes a loud humming noise when using generator power. It does not make the same noise while on 30 amp shore power. It does heat up, but is quite noisy. We are leaving for FMCA convention Friday AM and will be using the generator all next week. Will be gone a month so can't get it back to the dealer until we return.

Any ideas or things I can check?
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Old 02-20-2008, 12:26 PM   #3
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Having asked this question before, the first thing to check is voltage at the Microwave outlet. Then you'll know if it is the Microwave or the generator/transfer switch.

Given that it works great on shore power it is likely low voltage. If you do a search you'll find many suggestions. I don't have the post handy but, it was recent.
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Old 02-21-2008, 12:46 AM   #4
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You should also have the frequency of the power coming out of the generator as well. It should be 60 hertz while under load and voltage of about 120 +/- 8%.
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Old 02-21-2008, 01:29 PM   #5
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I just had an electrician friend check it. There is 62 Hertz with nothing on. It drops a little when the microwave comes on. When the AC comes on, it drops below 60 and the noise goes away. He couldn't get to the generator to adjust it. I don't know how they will work on it.
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Old 02-22-2008, 05:44 PM   #6
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The generator depends on constant RPMs to keep the frequency and voltage correct. If it is not maintaining 60 Hz, perhaps the speed governor is at fault.
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Old 03-04-2008, 06:29 PM   #7
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Onan and Winnebago tested the generator at Pomona FMCA rally. They both agreed the generator is performing as it should. They both think it is a problem with the microwave itself. I will take it back to the dealer when we return home.
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