KitchenAid Microwave F3C and F4E1 Error Codes: Cavity Thermistor
F3C and F4E1: KitchenAid names the cavity temperature thermistor or 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.
What this code means
Possible problem with the cavity temperature thermistor or its wiring.
What the two codes have in common
KitchenAid prints one sentence under both F3C and F4E1 in its over-the-range microwave help: there could be a problem with the cavity temperature thermistor or its associated wiring.
At a glance
| Code | F3C / F4E1 |
|---|---|
| What it means | Possible problem with the cavity temperature thermistor or its wiring. |
| What you can check | Turn off the breaker for sixty seconds, switch it on, and stay nearby for sixty seconds watching for the code. Check that the microwave runs as usual. |
| When to call a technician | If F3C or F4E1 shows again, arrange a service visit. No owner test or part swap exists for the thermistor, and the covers should stay on. |
A thermistor, defined
It is a small part that senses temperature; heat changes its electrical resistance. The cavity is the oven’s cooking space. This is general background, since the articles do not state what the microwave does while the code is displayed. Nothing about that is claimed here.
The only owner step: a breaker reset
- Turn off the breaker(s) feeding the microwave. Count sixty seconds.
- Turn the breaker(s) on.
- Stay nearby for sixty seconds and look for F3C or F4E1.
- Check that the microwave runs as usual.
If F3C or F4E1 shows again
The articles’ next move is arranging service. There is no owner test or part swap described for the thermistor.
Related thermistor entries
- F3H / F4E4: humidity thermistor
- F3T2: convection thermistor
- F3T4: magnetron temperature thermistor
Details to pass along
Say which code appeared and whether the reset made it disappear at all. If both codes have shown at different times, report both along with the model number; per KitchenAid they are the same fault path. Do not take covers off. Internal work is for a technician, which is general safety advice and not from the KitchenAid page.
Microwave service across KitchenAid metro areas
For KitchenAid microwave service in the Miami, New York, Houston, Los Angeles and San Diego metro areas, call (844) 919-2035. Tell the dispatcher the code, the model number and that you tried the breaker reset.
Source: KitchenAid Product Help, Over-the-Range Microwave Error Code
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.
Sources & references
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