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Error code · Microwave

Whirlpool Over-the-Range Microwave Code F3H1: Humidity Sensor

If a Whirlpool over-the-range microwave such as model WMH31017HS, WMH32519HZ or WMH53521HZ displays F3H1, the control has found a problem with the humidity sensor or its wiring. The microwave shows the code and may not run…

Medium · inspection needed
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Code
F3H1
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3H1 means

If a Whirlpool over-the-range microwave such as model WMH31017HS, WMH32519HZ or WMH53521HZ displays F3H1, the control has found a problem with the humidity sensor or its wiring. The microwave shows the code and may not run automatic features as usual. The brand names no failed part and gives a power reset only, so F3H1 means we test the humidity sensor circuit, not that a sensor must be replaced.

Common causes of F3H1

  • Humidity sensor
  • Wiring and connector for the sensor
  • Control board input
✓ One safe check you can try

1. Flip off the microwave's breaker. 2. Wait out a full minute. 3. Flip it on. 4. Look for F3H1 on the display during the next minute. 5. A clear display lets you run a short normal cycle to check operation. 6. If F3H1 appears again, do not use the microwave and call us.

! Why to stop there
  • The code points to a circuit and not a part, so a reset does not settle which piece needs work.
  • We test the sensor, its connector and the control input in order.
  • You see the written price before we repair anything.
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

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
F3H1F3H1 questions
How is F3H1 different from F3H?

On over-the-range models, F3H names the humidity thermistor, while F3H1 names the humidity sensor. Both use the same reset, and we confirm the actual part on the unit.

Can cooking steam cause F3H1?

The brand does not list steam as a cause. Let the microwave cool and dry for a while, then do the breaker reset. If F3H1 returns, the circuit needs testing.

Should I replace the sensor myself?

We advise against it. The sensor is inside the unit and the code names a circuit, not a confirmed bad part. A test avoids paying for a part that may not be the cause.

Book a visit

Still seeing F3H1?

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

(713) 589-6107