Question about Whirlpool WMH2175XVB Microwave Oven

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I have a Whirlpool microwave that ran but did not heat. while trying to identify the problem the fuse blew. I replaced the fuse but it immediately blew again when power was applied. what is causing the fuse to blow.

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  • Master
  • 14,553 Answers

A dead short---most have a large diode inside that you may have by accident destroyed. I will attach a photo of a typical diode but yours likely will be similar or may look different---it will have the diode symbol on it and or a band at one end---it has to go the same direction as the one in the unit.

Simple to test with a meter--resistance reading should NOT read like a fuse.
I have a Whirlpool microwave that ran but did not  - 12_6_2012_11_35_53_pm.jpg


note the triangle shape on this one

Posted on Dec 06, 2012

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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MicrowaveSvc
  • 9086 Answers

SOURCE: Microwave ahs power but doesn't heat.

The most common causes for a lack of heating are a bad door switch, a loose connection on the magnetron, a bad magnetron, bad connection on the control circuit board, a bad relay on the board, bad high voltage diode, or bad high voltage transformer. If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk You can find helpful exploded view diagrams and order parts by entering your model number here: http://tinyurl.com/gv383

Posted on Sep 28, 2007

SOURCE: No power from Whirlpool.

The problem was a defective switch. There are 3 switches on mine. 1 on the top door latch, and 2 on the bottom. one of the switches on the bottom connected the power and neutral together, unless it was activated at the same time as the other 2, causing the breaker to trip or the internal fuse to blow. When unhooking the wire going from this switch to the other switch, everything works great now. Though I still need to replace the switch.

And for Basic 1. Yes my microwave did have a fuse in it it's ceramic, I got a pack of them at Radio Shack 4 for 3$ 250V 20 Amp. There should be a wiring diagram inside the microwave, mine was inside a black bag, so it may be hard to see.

Mine was up top next to the fuse behind the Plastic Grill and then a small metal grill. Some are behind the control panel, to fix this remove the screw at the top and then slide the control panel up and it should unhinge.

Posted on Apr 01, 2008

MicrowaveSvc
  • 9086 Answers

SOURCE: Whirlpool GH518XP

Hattiemay

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.

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.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

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

Please feel free to contact me directly if you need more help.

William E. Miller, AS-EET
prototech@usa.net
http://www.microwavedisplay.com

Posted on May 30, 2008

MicrowaveSvc
  • 9086 Answers

SOURCE: Whirlpool microwave MH1170xsy0 1000 watts

With the symptoms you mention, I would suspect:

- loose or corroded connection at the magnetron
- bad magnetron
- shorted high voltage diode

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

Here are some links you or someone you know can use for test help, but read their safety warnings first:

http://www.gallawa.com/microtech/diode.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

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

Posted on Aug 21, 2008

welcomejee
  • 10594 Answers

SOURCE: panasonic genius microwave light bulb

Does your microwave front display lite?

Posted on Aug 27, 2008

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You can order Whirlpool parts my model number here.
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For more free DIY and other help & advice, feel free to contact me via my site.

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Did you replace the fuse yet?

Did the new one blow?

If so, and if it went dead almost immediately after pressing the Start pad, that's usually a shorted high-voltage capacitor.

If so, and if if it went dead a few seconds after pressing the Start pad, that's usually a failing high-voltage transformer.

If the new one did not blow, and the microwave still makes a growling or grinding noise, but does not heat, you probably have a shorted high voltage diode or a bad magnetron.

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http://www.gallawa.com/microtech/diode.html (if it is NOT shorted, it's probably fine)
http://www.gallawa.com/microtech/cap_test.html
http://www.gallawa.com/microtech/mag_test.html
http://www.gallawa.com/microtech/xformer.html

There should also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

You can usually find helpful exploded view diagrams and order parts by entering your full model number here.

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

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