Question about Whirlpool MH7155XM Microwave Oven
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.
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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Hello - This may or may not be specifically for your model, however these are generics instructions that I found.
To replace the light bulb to the over the range microwave you will need to follow the steps below:
1. To replace light bulb, first disconnect power to the microwave oven at the circuit breaker panel or by unplugging.
2. Remove the vent grill mounting screws.
3. Pull the vent grill away from the unit.
4. Remove the charcoal filter by pushing it inwards, then turn and pull it away from the unit.
5. Open light cover located behind filter mounting by carefully pulling up on the front edge.
6. Remove old light bulb and replace only with equivalent 30 watt bulb available from part distributor. Bulbs are also available at most hardware stores or lighting centers.
7. Replacing the microwave oven light cover by carefully pushing into place. Replace the charcoal filter. Push the vent grill back into place (engaging both the bottom and top tabs) and replace the vent grill mounting screws.
Note: DO NOT USE BULB LARGER THAN 30 WATTS.
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