KitchenAid microwave F4E2: magnetron temperature sensor error
F4E2 on this built-in model means the control is getting an invalid reading from the sensor that monitors magnetron temperature.
What F4E2 means
- Brand
- KitchenAid
- Appliance
- Built-in microwave
- Code
- F4E2
- Documented meaning
- Magnetron temperature sensor error
- Applies to
- 6 KitchenAid models on 1 platform
- Can you keep using it?
- No — stop and have it checked
What the microwave is detecting
The control watches the magnetron's temperature to protect it from overheating. When the sensor reading is missing or out of range, it sets F4E2.
Causes listed for this condition
In the order the service documentation checks them. Documented causes come from the manufacturer's service documentation for these platforms; possible causes are based on how the system works; unconfirmed marks common assumptions that the documentation does not support.
- Possible A failed magnetron temperature sensor.
- Possible A loose or damaged sensor connection.
Safe checks you can make
- Unplug the microwave (or switch off its breaker) for one minute, then restore power and see whether the code comes back.
- Do not remove the outer cabinet or the control panel. Nothing inside a microwave is owner-serviceable.
This stage requires professional testing. Full diagnosis involves hazards such as live line voltage, gas, a sealed refrigerant system or microwave high voltage. Do not attempt it yourself.
What a technician checks
- Checks the sensor and its connection.
- This requires professional testing. Every component behind the microwave's outer cabinet shares space with the high-voltage circuit, and the high-voltage capacitor can hold a lethal charge even after the unit is unplugged.
Typical repairs and cost
Depending on what diagnosis finds, this code can lead to one of these repairs:
| Repair | Typical range | Labor |
|---|---|---|
| Microwave no-heat repair (magnetron or high-voltage circuit) | $230–$520 | Moderate |
| Microwave control board replacement | $230–$520 | Moderate |
Typical total ranges for the Las Vegas area, parts and labor included. The final cost depends on diagnosis, the exact model, parts availability and whether other damage is found.
Can you keep using it?
Stop using it until it is checked. Unplug the microwave. Without this reading the control cannot protect the magnetron from overheating.
KitchenAid models documented with this code
And 1 more. Use the model lookup to check yours.
Related problems and codes
Other codes documented on the same KitchenAid platforms:
Repair or replace?
A fault code alone rarely justifies replacing a microwave. Most F4E2 repairs involve a single component once diagnosed. Replacement becomes worth considering when the unit is near the end of its typical 8–10-year life and the diagnosed repair is a major one. See the repair-or-replace guide.
Need F4E2 diagnosed in the Las Vegas area?
We repair Whirlpool, Maytag, KitchenAid, JennAir, Amana and other Whirlpool-family appliances in Las Vegas, Henderson, Summerlin and Boulder City. A model number helps but is never required to book.