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Source-backed error-code guide

Reviewed

Whirlpool Microwave F4 E1 Error Code

F4 E1 is a cavity-temperature sensing fault. Because internal microwave sensing and high-voltage systems are not homeowner-service areas, keep troubleshooting to one Whirlpool reset and qualified service if the code returns.

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

What the appliance detected

Detected condition

Whirlpool associates F4 E1 with the cavity-temperature thermistor or its associated wiring.

What may contribute

Possible causes

  • The cavity-temperature thermistor may not be reporting normally.
  • The thermistor wiring or connector may require professional diagnosis.
  • The electronic control may require diagnosis if the sensing circuit 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 resetting it: F4 E1.
    • Confirm the complete Whirlpool model number and compare the code with the owner documentation for that exact microwave.

  2. Try one Whirlpool power reset

    • If there is no smoke, burning odor, repeated arcing, visible door damage, active water intrusion, 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 code 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 an error 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, or other internal part from the displayed code alone.

When to stop and request service

  • Request qualified microwave service if the code returns after the single Whirlpool 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 Whirlpool.

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