Written by
Maren Coleman Appliance Care EditorPublished October 29, 2026
VERIFIED
Error codeF4E1
ApplianceMicrowave
F4E1 in plain terms
The microwave is flagging the Cavity Temperature Thermistor, or the wiring connected to it. The manual’s answer for over-the-range models is a simple power reset.
How the reset goes
Leave the breaker off for one minute, or unplug the microwave for that same minute. Turn the power back on, then stay near the unit for a minute to see if F4E1 stays away. Finish by confirming the microwave runs as expected.
If F4E1 comes back after the reset, a technician can take it from there. Reach Whirlpool microwave repair in San Francisco at (415) 687-4102, and have the model number plus the steps you tried on hand.
Model compatibility: Whirlpool reuses codes across series and model years, so F4E1 may mean something different on another appliance or generation. Confirm this against your model’s documentation and record your full model number before acting.
Plain language
What this code means
F4E1 means the Cavity Temperature Thermistor or its wiring may have a problem.
Important safety warning. 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.
Seeing this code on your Whirlpool appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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