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02-20-2008, 11:06 AM
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#1
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 2,163
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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?
__________________
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination Gas UFO
Tire-SafeGuard, Koni's, Scan Gauge II, Blue Ox, SMI Stay-in-Play, Winegard Travler
http://travelinthomas.blogspot.com/
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02-20-2008, 11:06 AM
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#2
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 2,163
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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?
__________________
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination Gas UFO
Tire-SafeGuard, Koni's, Scan Gauge II, Blue Ox, SMI Stay-in-Play, Winegard Travler
http://travelinthomas.blogspot.com/
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02-20-2008, 11:26 AM
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#3
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Senior Member
Newmar Owners Club
Join Date: Sep 2006
Location: North Java New York
Posts: 1,300
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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.
__________________
Scott Crompton
07 Dutch Star 4304
Sue (DW)  Celia 10, Alec 8, Bella (Greyhound), Isis (Abyssinian) 
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02-20-2008, 11:46 PM
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#4
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Community Moderator
Gulf Streamers Club Country Coach Owners Club Appalachian Campers
Join Date: Mar 2000
Location: Chattanooga, Tn.
Posts: 8,263
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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%.
__________________
Mike, Certified Master RV Technician
Amy, RV Merchandiser; Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser w/ Banks & 2 toads
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02-21-2008, 12:29 PM
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#5
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 2,163
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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.
__________________
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination Gas UFO
Tire-SafeGuard, Koni's, Scan Gauge II, Blue Ox, SMI Stay-in-Play, Winegard Travler
http://travelinthomas.blogspot.com/
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02-22-2008, 04:44 PM
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#6
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Community Moderator
Fleetwood Owners Club Freightliner Owners Club Florida Cooters Club
Join Date: Jan 2000
Location: Silver Springs, FL. USA
Posts: 9,606
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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.
__________________
Gary Brinck
2004 American Tradition; 2007 GMC Acadia
Homebase in the Ocala Nat'l Forest near Ocala, FL
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03-04-2008, 05:29 PM
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#7
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Senior Member
Winnebago Owners Club Workhorse Chassis Owner
Join Date: Aug 2007
Location: Sonoma County, CA
Posts: 2,163
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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.
__________________
Wayne & Roberta and Maggie the Miracle Dog
08 Winnebago Destination Gas UFO
Tire-SafeGuard, Koni's, Scan Gauge II, Blue Ox, SMI Stay-in-Play, Winegard Travler
http://travelinthomas.blogspot.com/
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