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Source-backed error-code guide

Reviewed

Amana Microwave E21 / E22 Error Code

E21 and E22 are two electrical states of the same thermal-sensor path. Keep owner troubleshooting outside the cabinet: record the exact code, try one documented reset when conditions are safe, and request service if it returns.

Applies to Amana over-the-range microwave with an applicable electronic display

What the appliance detected

Detected condition

Amana states that E21 reports an open thermal-sensor circuit and E22 reports a shorted thermal-sensor circuit to the control board.

What may contribute

Possible causes

  • The thermal-sensor circuit may be open or shorted.
  • The thermal sensor or associated wiring may require professional diagnosis.
  • The appliance control board may require diagnosis if the sensor path is otherwise intact.

Start conservatively

Safe preliminary checks

Work in order and stop whenever a step is not supported by the documentation for your model.

  1. Record the display and confirm the model

    • Photograph or write down the exact display before changing anything: E21, E22.
    • Confirm the complete Amana model number and compare the display with the owner documentation for that exact microwave because code sets vary by platform.

  2. Try one Amana power reset

    • If there is no smoke, burning odor, repeated arcing, visible door damage, active water intrusion, severe overheating, or repeated breaker trip, switch the microwave circuit breaker off for one full minute.
    • Restore power once, monitor the display for at least one minute, and verify normal operation without opening the cabinet.
    • If the display returns, stop using the microwave and request qualified service rather than repeating resets.

Actions not recommended

  • Do not remove the outer cabinet, control panel, vent housing, waveguide cover, or any service panel to chase a display code.
  • Do not touch or test the high-voltage capacitor, transformer, inverter, magnetron, internal fuse, interlock wiring, control boards, sensors, thermistors, relays, or internal harnesses.
  • Do not bypass, tape, bridge, defeat, or adjust the door-interlock system, and do not operate the microwave with a damaged or misaligned door.
  • Do not perform live-voltage, continuity, resistance, capacitor-discharge, or internal connector tests as an owner troubleshooting step.
  • Do not replace a keypad, sensor, thermistor, control board, relay board, switch, or other internal part from a display code alone.

When to stop and request service

  • Request qualified microwave service if the display returns after the single Amana one-minute power reset.
  • Leave power disconnected and arrange service immediately for smoke, a burning odor, repeated arcing, a repeated breaker trip, visible door or wiring damage, or water near electrical parts.

Documented source

Official information reviewed

Our summary is based on manufacturer support material and stays within the limits of that material.

Source reviewed by Appliance Help HQ: September 24, 2026.

Appliance Help HQ is an independent informational site and is not affiliated with or endorsed by Amana.

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