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Error code · Microwave

F4E4 on a Whirlpool Over-the-Range Microwave: Humidity Thermistor

If a Whirlpool over-the-range microwave such as model WMH31017HS, WMH32519HZ or WMH53521HZ shows F4E4, the control has a problem with the humidity thermistor or its wiring. The thermistor helps the microwave sense moisture. The code appears…

Medium · inspection needed
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Code
F4E4
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F4E4 means

If a Whirlpool over-the-range microwave such as model WMH31017HS, WMH32519HZ or WMH53521HZ shows F4E4, the control has a problem with the humidity thermistor or its wiring. The thermistor helps the microwave sense moisture. The code appears on the display, and the brand gives a power reset with no failed part named. So F4E4 is a prompt to test the humidity sensor circuit.

Common causes of F4E4

  • Humidity thermistor
  • Humidity sensor wiring and plug
  • Control board input
✓ One safe check you can try

1. Let the microwave cool and dry if it was just used. 2. Turn its breaker off for a minute, then on. 3. Watch for F4E4 on the display for a minute. 4. If it stays clear, try a short cycle. 5. If F4E4 comes back, call us.

! Why to stop there
  • The reset clears the display only and cannot show where the real problem is.
  • We check the thermistor, its connector and the control input in turn.
  • We quote in writing first, and completed repairs carry a 30-day workmanship warranty.
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
F4E4F4E4 questions
How is F4E4 different from F3H?

On over-the-range models, both name humidity sensing. F3H refers to the humidity thermistor and F4E4 is listed with the same part, so we check which circuit your control reports.

Does steam from the range cause F4E4?

The brand does not list that. Let the unit cool and dry, then try the breaker reset. If F4E4 returns, the circuit needs testing. That helps us pick the right circuit to test.

What does the visit involve?

We test the humidity thermistor circuit, explain what we find, and give a written price before any repair. You decide whether to go ahead. Nothing is replaced before you have agreed to the price.

Book a visit

Still seeing F4E4?

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

(713) 589-6107