F3C and F4E1 both point to the cavity temperature thermistor and its wiring.
Model compatibility: KitchenAid reuses codes across series and model years, so F3C / 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
Possible problem with the cavity temperature thermistor or its wiring.
On a KitchenAid over-the-range microwave, F3C and F4E1 are two displays for a single diagnosis. The Product Help text for each says the cavity temperature thermistor, or the wiring connected to it, may be at fault.
The terms in plain words
Thermistor: a small temperature-sensing part whose electrical resistance shifts as it heats or cools.
Cavity: the cooking space inside the microwave.
Both definitions are general background. Neither article says how the microwave behaves while the code is showing.
The power reset KitchenAid lists
Switch the microwave’s circuit breaker(s) off and leave them off for 60 seconds.
Switch the breaker(s) back on.
Watch for a full minute to see whether F3C or F4E1 reappears.
Run the microwave to confirm it works normally.
When the code comes back
Both articles then send you to service. They give owners no way to test the thermistor and no replacement procedure.
Neighboring thermistor codes
Each of these names a thermistor in a different spot:
Jot down which code you saw and whether the reset cleared it, even for a moment. Because KitchenAid treats the two codes as one fault, seeing F3C one day and F4E1 another is not two separate problems according to the source; mention both if both showed up. Keep the microwave closed up and leave anything internal to a technician. That is ordinary appliance safety, not a line from KitchenAid.
KitchenAid microwave repair in Los Angeles
When the reset does not hold, call (310) 363-8964 for KitchenAid microwave service in Los Angeles. Have your model number and the code (F3C or F4E1) ready so the visit can be matched to the cavity thermistor named in the article.
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 KitchenAid appliance?
Book a specialist visit for a clear estimate and approval before any repair.
