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Whirlpool Microwave E21 Error Code

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Maya Ortiz Written by Maya Ortiz Appliance Repair Content Specialist Published October 20, 2026

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Code overview at a glance.

The facts for this Whirlpool error, a plain-language snapshot, and what to confirm against your model number.

Error code E21
Appliance Microwave
Quick answer

E21 means the thermal sensor circuit reported open; the sensor, control board or wiring may be at fault.

Model note: Whirlpool reuses codes across series and model years, so E21 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.

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What this code may mean.

A plain-language reading of the code — always confirm against your model’s documentation.

Thermal sensor circuit reported open.

E21 means the thermal sensor circuit reported open to the control board. The Thermal Sensor, the Appliance Control Board or the associated wiring may be the problem on your over-the-range microwave.

Reset the power

Shut off the breaker for one minute and turn it on. Then watch the microwave for a minute to see if E21 comes back, and verify that it operates.

Related codes

  • E22 is the same sensor circuit reporting a short.
  • E61 is an open oven sensor circuit.

Repair in Los Angeles

Call (310) 448-6692 for Whirlpool microwave help in Los Angeles if E21 returns. Tell us the code, the model and your reset. Information on microwave service.

Source: Whirlpool Product Help: E21 – Error Code – Over-the-Range Microwave

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Safety warning before you continue.

Stop immediately if you notice smoke, sparks, a burning smell, gas odor, or water near electrical parts.

Important

Do not attempt repairs involving electrical components, gas, water lines, refrigerant or sealed systems. Unplug the appliance if it is safe to reach the outlet, and leave internal diagnostics to a qualified technician.

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Seeing this code on your appliance?

Book an Whirlpool appliance service visit for a clear estimate and approval before any repair.

Experienced technicians, clear diagnostics, and workmanship coverage on completed repairs.

Book a Repair (310) 448-6692

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Ready to restore your Whirlpool appliance?

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Book a Repair (310) 448-6692

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Tell us what’s wrong — we’ll take it from there.

Share a few details and we’ll confirm an appointment. Prefer to talk? Call us and we’ll help right away.

Prefer to call? (310) 448-6692
  1. Share the symptom Tell us the Whirlpool model and what’s going wrong.
  2. Confirm a window We’ll schedule a visit that fits your day.
  3. Approve before work You get a clear estimate — nothing starts without your OK.
Phone (310) 448-6692
Email info@whirlpoollosangeles.support
Hours Mon–Sat: 8:00 AM – 7:00 PM
Service area Serving Los Angeles County and Orange County.
Response time Appointment timing depends on ZIP code, route capacity, and appliance type.
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