Written by
Tessa Brandt Appliance Care EditorPublished October 29, 2026
VERIFIED
Error codeF3C
ApplianceMicrowave
F3C: the cavity thermistor
A thermistor reads temperature, and F3C is tied to the one that monitors the cavity. Either that thermistor or the wiring around it may be at fault. The code is documented for over-the-range Maytag microwaves.
Steps for the owner
Cut power at the breaker for the microwave and leave it off for one minute.
Restore power at that breaker.
Give the display a minute and check whether F3C shows up once more.
Try the microwave to confirm it operates.
When F3C does not go away
If the code is back after the reset, schedule a technician visit; the thermistor and its wiring have to be checked inside the unit.
Technicians handle Maytag microwave repair throughout San Francisco and the Bay Area. Call (415) 649-2156 with the code F3C, your model number and what you have already done.
Model compatibility: Maytag reuses codes across series and model years, so F3C 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
The cavity temperature thermistor or its wiring may be faulty.
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 Maytag appliance?
Book a specialist visit for a clear estimate and approval before any repair.
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Replacement parts are selected for the exact model and confirmed with you before ordering or installation.
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Book a repair online or call us — clear estimates and approval before any repair work begins.
