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Whirlpool service — Whirlpool Microwave E21 Error Code

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Whirlpool Microwave E21 Error Code Open Thermal Sensor

Book a Repair (844) 968-2053
Daniel Reeves Written by Daniel Reeves 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
Content status Verified
Quick answer

The thermal sensor circuit is open on E21; sensor, control board or wiring are the possibilities.

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 open.

An open thermal sensor circuit

The control board received an open reading from the thermal sensor circuit. Three things may be behind it: the Thermal Sensor, the Appliance Control Board and the associated wiring.

Reset it

  1. Breaker off for 1 minute.
  2. Breaker on.
  3. Monitor for 1 minute.
  4. Verify the microwave operates.

Next to E21

E22 reports a short instead of an open, and E24 is an overheat condition.

Microwave service in the SC area

We cover the Miami, New York, Houston, Los Angeles and San Diego metro areas; call (844) 968-2053 about Whirlpool oven and microwave service. Have E21 and the model number ready.

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 (844) 968-2053

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Book a repair online or call us — clear estimates, approval before any work, and a workmanship warranty on completed repairs.

Book a Repair (844) 968-2053

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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? (844) 968-2053
  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 (844) 968-2053
Email info@whirlpoolservicecenter.support
Hours Mon–Sat: 8:00 AM – 7:00 PM
Service area Serving Miami, New York, Houston, Los Angeles and San Diego metro areas.
Response time Appointment timing depends on ZIP code, route capacity, and appliance type.
(844) 968-2053 Book a Repair