Question about Whirlpool MH1150XMQ Microwave Oven

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Cook Top light

We just purchased a house with this microwave.  The model MH 1150XMB and it seems great but there is a problem with the light.  I tried turning it on and it has worked once.  It makes noise from pushing the button but the light does not come on.  I thought it maybe needed a new bulb but then when I used the microwave after taking out my food when I closed the door the light turned on.  Is there something that could just be loose how should I go about trying to fix this?

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This may have already been dealt with, but others can benefit from an accurate, thoughtful reply to this problem.

We see this a lot. The problem is on the control panel, which we regularly repair nationwide for $39.95 postpaid.

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.

Details of our service and critical safety information and disassembly information is at our site, linked here on Fixya:
http://tinyurl.com/yzjozk

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

Posted on Nov 26, 2007

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Check to be sure the bulb is screwed in tightly, if that is ok then there are screws holding the bottom panel of the microwave on that would have to bwe removed to check the wires going to the bulb receptacle.

Posted on Oct 31, 2007

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Microwave oven cooking time counter runs but does not cook? it is whirlpool MH 7130 XEQ; i also hear a huming sound whne it runs.


Sounds as if the magnetron tube inside has reached it's useful life...mag tubes are expensive and would outweigh the cost of a new uniot

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If the oven is set up to vent outside, then the metal mesh grease filters are used, and they should be cleaned in warm soapy water whenever they look greasy or dirty.

If the oven is set up to recirculate, then the charcoal filter is used, and it must be replaced (not cleaned) every 6-12 months, depending on use.

This model does not have a separate cooling fan like most other models. It replies on the vent fan for magnetron cooling, so if the filter(s) gets too dirty, it can reduce the cooling air flow, which can allow the magnetron to overheat and be destroyed.

I would need to know a little more to help narrow down the "no heat" problem.

If the cooling fan, turntable, and inside light all come on when you press "Start" to cook, then I would ask if you here a "thump" when you press "Start."

If so, then the high voltage section is getting energized. If not, then it may be the cook relay on the control board, which I can affordably repair.

The support page for your oven is here, and it has manuals and part lists you can download.

For more free DIY and other help & advice, feel free to contact me with your full model number and FCC ID number from the tag on your oven.

William E. Miller, AS-EET
pupista@gmail.com
http://www.microwavecontrol.com
Microwave Oven Control Panel Repair Nationwide
"Recycling by repairing since 1982"

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In order to try to set your mind at ease I will have to explain the Basics on how a Microwave Oven Functions.
When a Microwave Oven is set to COOK ...START. It cooks at 100%. There is no lowering of the heat as with a Range ( Cook Top) Control. So in order to do the other things such as DEFROST, WARM, or anything other than 100% COOK. A COOK ON- COOK OFF system was utilized. To DEFROST, the Microve COOKS at 100% for 30% of the TIME, then IDLES for 70% of the TIME. COOK ON 30% of the TIME, COOK OFF 70% of the TIME = DEFROST This is why you can hear the CYCLE. More power is required during the ON CYCLE, thus the lower vibration. The Vibration occurs when the High Voltage Transformer is turned ON ( COOK ON).
The VIBRATION seems to have got louder with age. This is somewhat normal as there is a vibration from the High Voltage Transformer present every time the Microwave is used. screws and other metal parts seem to get loose with this vibration. There is no solution, unless you can tighten EVERY screw, nut, and bolt in the unit.
Sorry!

Dec 07, 2007 | Kenmore 62642 / 62644 / 62649 Microwave...

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