Question about Whirlpool MH7155XM Microwave Oven
We see sparks coming out upper right corner vent. on lower power it doesn't make the noise until it runs a little bit.
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Posted on Jan 02, 2017
You either have a shorted exhaust fan thermostat or a shorted fan relay on the control circuit board.
While we regularly repair these controllers by mail for $39.95 postpaid with a one-year guarantee, or you can order a new control circuit board (part number) from the Pros here, we strongly suggest that you or someone you know check the exhaust fan thermostat first.
It should read "open" on a continuity (ohms) test. If it reads closed (shorted) it is bad and the fan will run all the time.
Or you can simply unplug the oven's power, disconnect one lead from the thermostat, tape it over to prevent shorting, then plug the oven back in. If the fan still comes on, the problem is on the board. If it does not, the thermostat is shorted.
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.
We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.
Posted on Oct 18, 2011
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