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Error code · Microwave

Whirlpool Microwave Showing F3H on the Display: Humidity Sensor and Thermistor

The meaning of F3H depends on the style of Whirlpool microwave. On built-in microwaves and microwave drawers, such as WMC50522AS, it points to the microwave humidity sensor or its wiring. On over-the-range models such as WMH31017HS,…

Medium · inspection needed
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Code
F3H
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3H means

The meaning of F3H depends on the style of Whirlpool microwave. On built-in microwaves and microwave drawers, such as WMC50522AS, it points to the microwave humidity sensor or its wiring. On over-the-range models such as WMH31017HS, WMH32519HZ and WMH53521HZ, it refers to the humidity thermistor or its wiring. Either way, the display shows F3H and the guidance is a power reset with no named failed part, so this is a sensor circuit to test.

Common causes of F3H

  • Humidity sensor on a built-in microwave or drawer
  • Humidity thermistor on an over-the-range microwave
  • Sensor wiring and its plug
  • Control reading the sensor
✓ One safe check you can try

1. Turn the breaker for the microwave off, then wait a minute. 2. Turn it on and read the display. 3. Keep checking for F3H over the next minute. 4. If it is clear, a short, normal cook confirms the microwave works. 5. If F3H comes back, we need to test the humidity sensor circuit.

! Why to stop there
  • A reset does not show whether the sensor, wiring or control is reading wrongly, so a returning code needs testing.
  • We identify your microwave type, then test the humidity sensor circuit that belongs to it.
  • The price is written and agreed before work starts.
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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F3HF3H questions
Is F3H the same on every Whirlpool microwave?

The code points to a humidity sensor on both styles, but the part differs: a humidity sensor on built-in microwaves and drawers, and a humidity thermistor on over-the-range models.

What does the humidity sensor do?

It lets the control follow moisture in the cooking space for automatic features. F3H says the control cannot read it correctly or the wiring to it has a problem.

Will the microwave heat food with F3H?

The guidance is silent on that. Since the control is reporting a sensor problem, treat the microwave with caution and stop using it if the code keeps returning.

Book a visit

Still seeing F3H?

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

(713) 589-6107