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Error code · Microwave

Whirlpool Built-In Microwave with Error F4 E4: Humidity Sensor and Manager

Whirlpool built-in microwaves and microwave drawers, such as WMC50522AS, show F4 E4 when the control finds a problem with the microwave humidity sensor, the microwave appliance manager, or the wiring. The humidity sensor lets the microwave…

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Code
F4 E4
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F4 E4 means

Whirlpool built-in microwaves and microwave drawers, such as WMC50522AS, show F4 E4 when the control finds a problem with the microwave humidity sensor, the microwave appliance manager, or the wiring. The humidity sensor lets the microwave follow moisture for automatic cooking. The display shows the code, and the brand gives a power reset and no failed part. We use F4 E4 to decide which circuit to test.

Common causes of F4 E4

  • Microwave humidity sensor
  • Microwave appliance manager board
  • Wiring and connectors between them
✓ One safe check you can try

1. Turn off the breaker for the microwave and count out one minute. 2. Turn it back on. 3. Check the display for F4 E4 during the next minute. 4. If it is clear, try a short cycle. 5. If F4 E4 shows once more, stop using the oven and call us.

! Why to stop there
  • A reset restarts the boards but cannot tell us whether the sensor or the manager is the cause.
  • We read the humidity sensor circuit and test the board that reads it.
  • Nothing is repaired until you have the price in writing and agree to it.
Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.
→Same appliance

Other Microwave codes

Feature Not Available or Fault DetectedWhirlpool Built-in Microwave Message "Feature Not Available": Retry or Cut Power LOCWhirlpool Microwave LOC on the Display: Control Lock Is On PFWhirlpool Over-the-range Microwave Showing PF: Power Failure Indicator Press Cancel to ResetWhirlpool Built-in Microwave Message "Press Cancel to Reset": Error Cleared by Cancel F8 E4Whirlpool Microwave Drawer Error Code F8 E4: Exhaust Air Temperature Sensor Probe or Insert ProbeWhirlpool Built-in Microwave Asking for "Insert Probe": Seat the Meat Probe F8E5Whirlpool Microwave Code F8E5: Exhaust Air Temperature Sensor PUSH or PSHWhirlpool Built-in Microwave Shows PUSH or PSH: Press Start
F4 E4F4 E4 questions
What does the humidity sensor do?

It detects moisture in the cooking space so the microwave can run sensor-based features. F4 E4 says the sensor, the board or their wiring has a problem.

Does F4 E4 mean the microwave cannot heat?

The guidance is silent on that. The code points to a sensor circuit, but the control may block operation. We suggest not using it if the code returns after a reset.

Is F4 E4 the same as the F4E4 on over-the-range models?

No. On over-the-range microwaves F4E4 refers to the humidity thermistor, a different part and layout. Built-ins with a space in the code follow the explanation here.

Book a visit

Still seeing F4 E4?

A technician diagnoses it on site and gives you the price in writing before any work starts.

(713) 589-6107