Question about Whirlpool MH3184XP Microwave Oven

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Whirlpool MH3184XP - No Power

Microwave is about 2 years old and I have checked the fuse on the top right and it seems to be fine. The microwave doesn't turn on at all.
Please help.

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  • rbindra Apr 08, 2008

    I fixed it few days ago. It was the small ceramic fuse under the inline fuse. It's covered in a plastic casing. Couldn't find the same fuse anywhere so I ended up replacing it with a 4Amp 250V glass fuse.

  • abeler Sep 11, 2008

    misplaced the other fuse, not the fuse in the plastic case. can you tell me the numbers on the ceramic fuse?

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  • Whirlpool Master
  • 8,858 Answers

A microwave can be dead for many reasons.

If it goes dead for a while during or after cooking then comes back on, the magnetron is probably overheating and causing the magnetron thermostat to open. Then when it cools, it closes the circuit and allows power through again.

If it's intermittent or random, it may be a bad connection, usually on the control board or a loose fuse holder, or even an intermittent fuse.

You should do a continuity test the fuse while it's in the holder (with the microwave unplugged, of course) then turn the fuse by hand or take it out and put it back in, then test it again. If you remove the fuse, then press the meter leads against the ends, it can allow internal contact to be made and make a bad fuse appear to be good.

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

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

If it goes dead or blows the breaker when you plug it in or open or close the door, then there's a problem with a door switch or door switch mount.

If the fuse is good, it may be an open thermostat or thermal cutout on or near the magnetron or on top of the cavity / body of the oven.

If you or someone you know decide to look into it, we have critical safety information 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 Apr 08, 2008

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