Question about Sharp Microwave Ovens
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Posted on Jan 02, 2017
> MMV5165BAB hood vent fan runs continuously
You probably have either a shorted base thermostat on the base of the chassis of the oven or a shorted fan relay on the control circuit board.
There should be a "mini-manual" (tech sheet) hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting, testing, and locating components.
At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.
You can find helpful exploded view diagrams and order parts by entering your full model number from the tag on the oven here.
We have the service / repair manual for this model and have uploaded it to our site here for free download to help you.
The base thermostat (which I believe has thinner pink and yellow wires attached, but not thicker black wires) should read normally open. If it shows continuity (virtually zero ohms or shorted) then it is bad.
Otherwise, I would say you have a shorted fan relay on the control circuit board.
We regularly repair such control units for customers nationwide by mail for $39.95 postpaid in about a week or so with a one-year guarantee.
Feel free to contact me directly (and please remind me of your full model number from the tag on the unit) for more information & help.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
William E. Miller, AS-EET
Microwave Oven Control Panel Repair Nationwide
Posted on Jul 30, 2009
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