Question about Whirlpool MH1150XMQ Microwave Oven

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Timed Power Loss

I have a Whirlpool MH1150XMQ microwave that stops cooking after ~4 mins of operation. The microwave continues to operate/look/sound like it is cooking, but food remains uncooked, then without warning after an additional ~4 mins of cooking, it will begin cooking again. I thought about overheating, but I could turn it off for 5-10 minutes after it stops cooking, but it still won't cook after a cool down until it operates for that 4 minutes or so. If I don't operate it for several hours it will cook just fine for ~4 minutes regardless of length of previous operation. Any ideas on this one?

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It sounds like your magnetron is failing, but generally, the most common causes of a failure to heat are:

- bad door switches or door switch mounts
- loose connection at the magnetron
- problem or loose connection on the control unit circuit board
- bad magnetron or other high voltage part (such as a shorted diode)

If you or someone you know decide to look into it, we have critical safety information, info on door switch diagnosis and replacement, and disassembly information at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

You can usually find helpful exploded view diagrams and order parts by entering your full model number here: http://tinyurl.com/gv383

There should also be a "mini-manual" hidden inside the unit behind the control panel, which is very helpful when troubleshooting.

We're happy to help and we appreciate your thoughtful rating of our answer.

Posted on May 02, 2008

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The vent fan on my over the range Whirlpool microwave (mh1150xmq-0) runs any time I use the microwave (as if I have turned the vent fan on "low"). This doesn't seem to affect cooking, but it...


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.

Oct 14, 2011 | Whirlpool MH1150XMQ Microwave Oven

1 Answer

Occassionally (about 5% of the time) the microwave continues to cook and buzz after the timer has run out and the fan stops running.


sounds like the program bord is faulty,, when your finished cooking leave the door open a little that will save the microwave from trying to cook nothing?

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The microwave was working great cooking bacon. While it was cooking the sound changed and it stopped cooking. The light was still on and it continued to rotate but it would not cook anymore. What's wrong?


first check the h.v. diode and the h.v. capacitor,one has opened up and is not producing h.v. to operate the magnetron tube,the cap is about 4" long and oval in shape with 2 wires coming out the one end,the diode is about 1-2" long black and can be square or round and are near the magnetron tube area of the oven,chk these first they're the cheapest to replace

Nov 19, 2009 | GE Spacemaker JVM1640SJ Microwave Oven

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I have Emerson Microwave #mw8999sv which has the Express Cook option- cooking 1 - 6 minutes. How do I cook for 1 minute 30 seconds, etc.? Thank you.


The owner's manual is here. On page 10 we find:

COOKING IN ONE STAGE
1. Press the POWER button; the Microwave and High
Cook indicators will light and “PL 10” will light in the
display.
2. Press the POWER button different times to set the
desired power; the display will show the percentage
you chose. If selecting power level 70%-10%, the
Low Cook indicator will light instead of the High
Cook indicator.
3. Press number keys to set the desired cooking time.
OPERATION(CONTINUED)
4. Press the START/+30SEC. button to start cooking;
the Microwave and one of the Cook indicators will
blink and the display will countdown the remaining
cooking time in minutes and seconds. It will beep
five times when cooking is completed.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.


Sep 08, 2009 | Emerson Microwave Ovens

1 Answer

Microware shutoff after ~4 min of cooking


Return it for warranty repair or replacement. Does the blower motor operate?

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Microwave external underside light no longer works


We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

The lights fan can be inoperable or stuck on or no bright, too. Sometimes this will similarly affect the exhaust fan operation, too.

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
prototech@usa.net
http://www.microwavedisplay.com

91756a3.jpg

May 20, 2009 | Whirlpool MH1150XMQ Microwave Oven

1 Answer

Whirlpool MH1150XMQ 1000 Watts Microwave--NO HEAT


About 95% of the time it is the magnatron. If the microwave is under 5 years old that part is often covered under warranty. I would check your manual. If not the p/n is 8206335 and it's about $80 and fairly easy to install. I just looked and the magnatron is covered.

http://www.managemyhome.com/mmh/lis_pdf/OWNM/L0523111.pdf

Labor to replace it would be about $125

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Whirlpool(GH7145XF2-0) does not work occasionally


That's how it would sound if you were cooking on a power level less than full power.

If you enter the cooking time and hit Start, it should cook at full power by default and not cycle like you describe.

If you are using some sensor cook setting or automatic type cooking setting, it may cycle like that normally.

The first thing to try is a "hard reset". Unplug it from the power line for a minute, plug it back in, set the clock, then try again.

Let us know if the hard reset doesn't fix it.

If you don't have your manual, you can download it free here. Check the lower right area to enter your model. number.

We're happy to help and we appreciate your thoughtful rating of our answer.

Jul 17, 2008 | Whirlpool GH6177XP Microwave Oven

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Does a microwave lose cooking power over time? having a problem cooking popcorn. whirlpool built in unit 18 yrs old. takes 4-5 min on high and cant cook most of it. more time just burs popcorn. i believe...


Yes. As the magnetron (The microwave generator) ages with use it becomes less efficient. As such it produces less powerful microwaves and loses penetrating power:::Spiceweasel.au

Apr 04, 2008 | Microwave Ovens

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