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Error code · Microwave

Whirlpool Over-the-Range Microwave Code F4E1: Cavity Thermistor or Wiring

F4E1 on a Whirlpool over-the-range microwave, such as WMH31017HS, WMH32519HZ or WMH53521HZ, points to the cavity temperature thermistor or its wiring. The thermistor reports the temperature inside the cooking space to the control. The display shows…

Medium · inspection needed
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Code
F4E1
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F4E1 means

F4E1 on a Whirlpool over-the-range microwave, such as WMH31017HS, WMH32519HZ or WMH53521HZ, points to the cavity temperature thermistor or its wiring. The thermistor reports the temperature inside the cooking space to the control. The display shows F4E1, and the brand gives a power reset and no failed part. We treat F4E1 as a sensor circuit to test, and it is a different code from the F4 E1 on built-in models.

Common causes of F4E1

  • Cavity temperature thermistor
  • Wiring and connector for the thermistor
  • Control reading the sensor
✓ One safe check you can try

1. Switch the over-the-range microwave's breaker off for a minute. 2. Switch it back on. 3. Watch the display for F4E1 for another minute. 4. If it is clear, run a short normal cycle and check that it heats. 5. If F4E1 returns, stop using the microwave and call us.

! Why to stop there
  • A reset cannot show whether the thermistor, wiring or control is giving the wrong reading.
  • We test the sensor circuit and compare it with the control's reading.
  • You approve a written price before we begin.
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.
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Other Microwave codes

F8E5Whirlpool Microwave Code F8E5: Exhaust Air Temperature Sensor PUSH or PSHWhirlpool Built-in Microwave Shows PUSH or PSH: Press Start F9Whirlpool OTR Microwave Error F9: Control and Relay Boards Registration ErrorWhirlpool Over-the-range Microwave "Registration Error": Network Checks F9 or F9E0Whirlpool Built-in Microwave Codes F9 and F9E0: Home Power Supply Sabbath, Sab, 5Ab, or 5A6Whirlpool Built-in Microwave Showing Sab or 5Ab: Sabbath Mode F9QWhirlpool Over-the-range Microwave with F9Q on the Display: Power Reset Code SEWhirlpool Over-the-range Microwave Error SE: Keypad Circuit
F4E1F4E1 questions
Is F4E1 the same as F4 E1?

No. F4 E1, with a space, is on built-in microwaves and names a sensor and the appliance manager. F4E1 is for over-the-range models and names the cavity thermistor.

Is F3C related to F4E1?

Both mention the cavity temperature thermistor in the brand's list for over-the-range microwaves. We check which circuit your control reports when we test. We verify on your unit which circuit it is.

Can I keep using the microwave?

If the code clears after the reset and the microwave works, yes. If it returns, stop using it, because the control cannot read the cooking space temperature.

Book a visit

Still seeing F4E1?

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

(713) 589-6107