Published September 2, 2026Updated October 17, 2026
Content status:
Verified
Error codeF3C
ApplianceMicrowave
Quick answer
JennAir over-the-range microwaves list F3C for a possible cavity temperature thermistor or wiring problem.
Model compatibility: JennAir 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
JennAir lists a possible problem with the cavity temperature thermistor or the associated wiring.
What the code covers
Food sits in the cavity, the interior of the microwave. JennAir’s over-the-range microwave help links F3C to the thermistor that senses the temperature in there and to the wiring serving it.
JennAir’s complete procedure
Cut power to the product at the breaker for one minute, then restore it.
Spend one minute watching that F3C stays off the display.
Check that the oven operates.
Owners are given nothing beyond this.
Background on the sensor
Resistance in a thermistor rises or falls as the temperature changes, which makes it a sensor. A missing or wrong value reaching the control produces a code. All of this is general, since F3C has no further cause given by JennAir.
If F3C returns
A qualified technician’s assistance may be needed, JennAir says. Faults in a sensor or its wiring are pinned down with test equipment, so no steps are offered past the reset.
Entries to compare
F4E1: the same cavity sensor, listed for over-the-range models.
F3T4: a separate sensor that watches the magnetron’s temperature.
JennAir over-the-range microwave service in Los Angeles
When F3C comes back, call (310) 622-9465 in Los Angeles. Keep the code, the model number and a note about the breaker cycle at hand. Our microwave repair page has related details.
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 JennAir appliance?
Book a specialist visit for a clear estimate and approval before any repair.
