Whirlpool Microwave: not heating

Based on 27 community discussions Community Analysis

⚡ Quick Answer: Most common fix for not heating: Replace magnetron, capacitor, and diode. (75.0% DIY success rate)

Common Causes

  • Magnetron failure (4 mentions)
  • Faulty door switches (3 mentions)
  • Blown diode or fuse (3 mentions)
  • Thermal cutoff activation (2 mentions)

Top Solutions

  1. Replace magnetron, capacitor, and diode.

    Success rate: 4.0% DIY: Yes Medium

  2. Check and replace faulty door switches.

    Success rate: 4.0% DIY: Yes Easy

  3. Replace blown diode and fuse.

    Success rate: 4.0% DIY: Yes Easy

  4. Replace cavity thermal cutoff.

    Success rate: 4.0% DIY: Maybe Hard

Can I Fix This Myself?

75.0% DIY Success Rate

DIY

Analysis based on 16 community discussions
View Sources

Data compiled from real discussions on r/appliancerepair and r/Appliances:

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  12. Seeking advice on DIY microwave repair: 2017 Whirlpool (WMH3...
  13. Whirlpool OTR Microwave (WMH75520AS0) - Replaced Magnetron &...
  14. Whirlpool microwave not heating and turntable not rotating f...
  15. Replacing 2001 Whirlpool Gold Countertop microwave converted...
  16. Whirlpool Microwave cycles but does not heat - Whirlpool WMH...

Community Discussions

gray plastic piece attached to inside of microwave

The gray plastic piece is a waveguide cover that should not be removed.

DIY View on Reddit →

stopped working

Replaced Whirlpool microwave with Panasonic NN-SC73LS, which fit perfectly without modifications.

DIY View on Reddit →

cycles but does not heat

Replaced blown diode and fuse, microwave is working again.

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I just want to type in the time and hit start.

Whirlpool microwave allows instant start with time entry and has a +30 seconds feature.

Pro needed View on Reddit →

loud hum and won't heat up

Replace magnetron, capacitor, and diode.

DIY View on Reddit →

Source: Reddit r/appliancerepair

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