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Old 03-07-2014, 06:56 PM   #1
International Grey Nomad
1999 35' Cutter Bus Diesel Pusher
Bulahdelah , NSW Australia
Join Date: May 2010
Posts: 79
OK, Who is the paractical Joker who swapped polarity

We've had the Airstream for several years and have never bothered using the range hood extraction fan that is incorporated in the Sharp microwave convection oven - because is was way too noisy and didn't seem to do the job it was supposed to do. Also the external flap on the exhaust vent banged around in the wind all night so I closed it using the tabs provided.

Recently thought to find out why it worked so poorly and released the flap on the outside vent and turned it on. Much noise and not much suck and I noticed the outside flap was being sucked hard back towards the duct instead of swinging outward - which only explains the lack of suck inside if the fan is running in reverse.

Anyone had cause to check out the circuitry - is the fan and light supplied from the 12V house system and is the fan controlled by a relay operated via the microwave electronics, and if so, could the fan be running backwards because the 12V supply is connected back the front.

Failing that, anybody removed the microwave and if so, any pointers on how it is fixed in. As in many things, the Airstream owners folder is rather ambiguous and has several possibilities, none of which make much sense at first reading



Tony LEE
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Old 03-07-2014, 07:00 PM   #2
Rivet Master
1977 Argosy 24
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Milltown , Wisconsin
Join Date: Mar 2006
Posts: 1,079
If it is running backwards, just cut and reverse the wires going to the motor.

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Old 03-07-2014, 08:35 PM   #3
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1996 36' Clipper Bus
Tub City , British Columbia
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My unit should be much the same as a yours. The Microwave will be a newer and different model and should be a bit lighter.

The wires for the vent fan are part of the microwave and not external on mine. Are you sure it is not a Charcoal recirculation style?

My unit requires two long screws that go into the top of the unit to be removed to release the micro from the aluminium mounting frame. Access requires removal of the monitor panel located above the micro.

See this thread.

You should be able to download a manual for the micro online that probably would be a good place to start.

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