Question about Whirlpool MH7155XM Microwave Oven

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When we start the microwave it sound like your welding .

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

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MicrowaveSvc
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SOURCE: The vent fan on my over the range Whirlpool

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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1 Answer

Making humming noise when plugged in. won't stop until I open the door. underneath light doesn't come on. right front corner inside of the microwave gets hot. replaced turntable motor same problem


Sounds like the vent to the outside is rattling or not secure or the door seal is not sealing properly. let us know Bruce if you need parts or anything else. thank you and leave feedback

Jul 13, 2016 | Microwave Ovens

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The unit started arching inside the front panel on the upper left corner.


Arcing Inside the Microwave - Martin Microwave Inc.

microwaveglasstrays.com/shop/articles-arcing.html
Microwave Glass Trays, : Arcing Inside the Microwave - Microwave Glass Trays ...glass tray, microwave plate, glass trays, turntable, microwave oven, carousel, ...microwave energy, and will eventually it will start producing arcs and put out one heck... the damage is non-repairable and the unit should no longer be operated.

Notes on the Troubleshooting and Repair of Microwave Ovens

www.repairfaq.org/REPAIR/F_micfaq3.html
Microwave oven does not respond to START button. First ..... but with the leakage from the spot welded waveguide inside the unit. ... My clue in was a spark between the waveguide and the case, when I was messing with the Controller PCB.) ...

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Dec 15, 2015 | Microwave Ovens

1 Answer

XL1800 buzzes but heats


If the magnetron was making louder noises prior then replace the magnetron. While the cabinet is open make sure to look for burned wires, check the continuity of thermal cutoffs, and check the main circuit-board for burned traces or components. The relays in most electronics are known for arcing (spot welding) and staying in the wrong position. Tap them hard with the back end of a screwdriver.
You may have to replace the capacitor too. During all of this use safe electrical practices by having the power cord unplugged. The capacitor could still have a high charge on it so be careful.

May 11, 2013 | GE XL1800 1100 Watts Microwave Oven

1 Answer

As plugged in microwave starts up doesn't stop even if you press clear and it also sparks where can i go to exchange it or have it replaced?


Sounds like someone tried heating something up with metal attached or possibly left a utensil, Chinese food with the metal handles or foil in the unit - throw it out and but a new unit - it's not worth it parts plus labor and it will never work right again the power scale will be off

Jan 14, 2013 | Emerson MW8777W Microwave Oven

1 Answer

My microwave is making a loud buzzing sound. Inside the microwave, on the upper right side, is a square area with holes in it. It sounds like the buzzing is coming from behind those holes. Also, after...


THe buzzing noise is most likely coming from the magneton. The magnetron is the main component of the unit (it generates the microwaves). Replaceing it can be very expensive. You may be better off getting a new oven. Prices for new microwave ovens have dropped significantly.

Jun 12, 2011 | Microwave Ovens

1 Answer

Microwave is ge spacemaker model # jvm1650sho5. when microwave is turned on about 4 seconds later it starts making a noise and has a burnt smell. The smell comes from the vent on upper left side and the...


this sounds like the magentron may be going. have you had any issues with it not heating? check your warranty book, some mags have a 3-5 year warranty, otherwise it's probably not worth repairing.

Nov 12, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

1 Answer

Bottons on microwave do not work


HI, the touch pad board has failed. you will need to replace this damaged board asap. this will correct the issue.

Sep 27, 2009 | Microwave Ovens

1 Answer

Crackling sound in microwave vent when power is off


By "powered off" can I assume you mean that it is plugged in and at idle, not cooking, just showing the clock?

If so, I'd say your control board is failing.

If my assumption is wrong, please write back with more details.

We regularly repair these control units for customers nationwide by mail for $39.95 postpaid in about a week with a one-year guarantee.

Feel free to contact me directly (and please remind me of your model number) 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
prototech@usa.net
http://www.microwavedisplay.com

Nov 02, 2008 | GE JEM25 Microwave Oven

1 Answer

Jvm1440bd Microwave


I thought I had answered this, but maybe the reply didn't post... Vent cap? Could you be more specific about what you tried and what the noise is like - where it seems to be coming from? It looks like on some of these models, the high-voltage section emits some interference which some people are blocking with a foil or metal shield. If they do that, they should definitely insulate it to prevent shorts. Another cause of vibration on these models is a fault in the stirrer located above the cover on the ceiling inside the cooking cavity. Feel free to post back so we can help further.

Jan 08, 2007 | GE JVM1410 Microwave Oven

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