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Error code · Microwave

Whirlpool Over-the-Range Microwave Showing F3T3 on the Display: Hood Thermistor Check

With F3T3 on a Whirlpool over-the-range microwave such as WMH31017HS, WMH32519HZ or WMH53521HZ, the control is flagging the hood temperature thermistor or its wiring. The hood is the vent part of the unit above the range.…

Medium · inspection needed
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Code
F3T3
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F3T3 means

With F3T3 on a Whirlpool over-the-range microwave such as WMH31017HS, WMH32519HZ or WMH53521HZ, the control is flagging the hood temperature thermistor or its wiring. The hood is the vent part of the unit above the range. The display shows the code and the brand supplies only a power reset, naming no failed part. For us, it marks the hood sensor circuit as the first place to test.

Common causes of F3T3

  • Hood temperature thermistor
  • Connector and leads for the hood sensor
  • Control board
✓ One safe check you can try

1. Put the microwave's breaker in the off position. 2. A minute later, put it back on. 3. Watch for F3T3 for one minute. 4. If the display is clear, check that the microwave runs and that the vent fan responds. 5. If F3T3 comes back, stop using the unit and call us.

! Why to stop there
  • A reset restarts the control but cannot show which part causes the code.
  • We check the hood sensor circuit and the control input, in that order.
  • You get a written price first, and 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.
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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
F3T3F3T3 questions
What is the hood temperature thermistor?

It is a temperature sensor in the vent hood section of the over-the-range microwave. F3T3 means the control cannot read it correctly or the wiring has a problem.

Could cooking heat from the range below cause F3T3?

Nothing in the guidance names that as a cause. Let the unit cool, then try the breaker reset. If the code returns, the sensor circuit needs testing.

Is F3T3 serious?

It is a temperature sensor code, and the brand gives no safety warning for it. Still, stop using the microwave if it keeps returning until the sensor circuit has been checked.

Book a visit

Still seeing F3T3?

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

(713) 589-6107