JennAir Built-In Microwave F4E3 Error Code

Warm air has to get out of a working microwave, and F4E3 is the code about the sensor watching that outflow. In JennAir’s built-in microwave article the microwave exhaust air temperature sensor, along with its wiring, is the part named.

Questions the code leaves open

Nothing is stated about how hot the air is, what caused the code, or what you would notice. Nothing says the exhaust is blocked or the unit is overheating either, and assuming so would be wrong. The established fact is limited to the control flagging this sensor circuit.

The reset, in order

1. Switch the breaker off and keep it off a full minute.
2. Switch it back on.
3. Spend one minute watching whether F4E3 shows up again.
4. Check that the oven operates.

JennAir’s entry includes no vent or filter inspection. Nothing in it asks you to remove or clean any part.

When a technician takes over

If the code is still there after the reset, testing of the sensor and wiring is needed, and that is outside normal owner work. Say whether it came straight back or only after some time, and what you were doing with the microwave when it appeared.

More built-in sensor codes

• F4E6: wave guide temperature sensor.
• F8E4: exhaust fan air temperature sensor.
• F8E5: exhaust fan air temperature sensor as well.

Microwave repair in Los Angeles

Call (310) 622-9465 about F4E3 and give the model number. Jot down whether the reset held. The article lists no cleaning or airflow checks for the exhaust path.

Source: JennAir Product Help, Built-In Microwave Error Codes; JennAir Product Help, Wall Ovens Error Codes