Question about Whirlpool MH7155XM Microwave Oven

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Whirlpool microwave oven mh7155xmb0 not venting

We have this unit for 5 years. It used to draw steam from the range below into and thru the filters, but does not now. Filters are cleaned. The unit is setup for outside venting thru a duct which goes out thru the roof. Since there is no draw of the steam at all, I suspect some malfunction inside the unit. Fan motor runs on all 4 speeds.

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Possibly a bird built a nest (swallows) in or on the roof vent. Make sure the fan turns freely when off. Check the vent tube that goes up to the roof--if flex-tubing, it may have collapsed and pinched off the air flow (it may be too long). Make sure that a one-way valve which should be near the exit of the hood is free to move when air flow pushes on it. This valve is supposed to prevent back-flow of air into the house. Hope this helps!

Posted on Nov 17, 2009

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