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Error code · Microwave

F4 E3 on a Whirlpool Built-In Microwave: Sensor for Exhaust Air Temperature

F4 E3 on a Whirlpool built-in microwave or microwave drawer, such as WMC50522AS, points to the microwave exhaust air temperature sensor or its wiring. The sensor reports how warm the air leaving the microwave section is,…

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Code
F4 E3
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What F4 E3 means

F4 E3 on a Whirlpool built-in microwave or microwave drawer, such as WMC50522AS, points to the microwave exhaust air temperature sensor or its wiring. The sensor reports how warm the air leaving the microwave section is, which the control uses to keep it from running too hot. The display shows F4 E3 and the brand gives a power reset with no failed part named, so we treat it as a sensor circuit to test.

Common causes of F4 E3

  • Microwave exhaust air temperature sensor
  • Plug and wiring on the exhaust sensor
  • Control board reading the sensor
✓ One safe check you can try

1. Leave the microwave unused while F4 E3 shows. 2. Make sure nothing blocks the vents or sits against the oven. 3. Turn its breaker off for a minute, then back on. 4. Look at the display for another minute. 5. If it is clear, try a short cycle. If F4 E3 appears again, call us.

! Why to stop there
  • The reset cannot show whether the sensor, wiring or control is wrong, so a returning code needs testing.
  • Because the sensor protects against overheating, we confirm the circuit before the oven runs again.
  • You hear the finding and see a written price before work.
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

FC E8Whirlpool OTR Microwave Registration Code FC E8: Entry Mistake FCE8Whirlpool Over-the-range Microwave Registration, FCE8: Wrong Model Selected 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
F4 E3F4 E3 questions
What does the exhaust air sensor do?

It measures the temperature of the air leaving the microwave section, which helps the control manage heat. F4 E3 says it cannot read that sensor correctly.

Why is F4 E3 treated more carefully?

It involves a temperature sensor that guards against running hot. The brand gives no safety warning, but we do not want you using the oven on an unproven sensor.

Could blocked ventilation be the cause?

The brand does not list that. Make sure nothing blocks the oven's vents and the area around it is clear, then do the reset. A returning code still needs a test.

Book a visit

Still seeing F4 E3?

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

(713) 589-6107