JennAir Built-In Microwave F4 Error Code

The plain code F4, with nothing after it, is the shortest member of the F4 family. For JennAir built-in microwaves it points to the oven cavity control or the wiring running to it.

Not an F4E code

Codes starting F4E name particular microwave parts, among them the inverter, the weight sensor and the humidity sensor. A display showing only F4 is a different entry, and the sensor-specific pages do not apply to it.

What an owner does

1. Switch the breaker off for a minute.
2. Switch it on.
3. Watch the unit for a minute for the code.
4. Verify that it operates.

The F4 articles list nothing else. The named item is a control, not a sensor, so an owner has nothing to inspect, and there is no do-it-yourself route in either the built-in microwave or the wall oven article.

If F4 returns

Treat it as a job for a technician, who can test the control and its wiring properly. Because the part named is a control and not a sensor, there is nothing for you to look at or clean beforehand, and the manufacturer lists no additional owner check.

Entries to compare

• F4E0 and F4E8: the microwave inverter.
• F6: also lists the oven control.
• F6E0: the appliance control board.

Built-in microwave service in Los Angeles

For an F4 that persists, call (310) 622-9465. Please bring the model number, and mention if the screen showed F4 on starting a function or while the unit sat idle, and whether yours is a stand-alone microwave or sits inside a wall oven installation. The manuals do not ask for those details, but they help place the request.

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