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Error code · Microwave

Whirlpool Built-In Microwave with Code 4d31: Control and Wiring Condition

On Whirlpool built-in microwaves and microwave drawers such as model WMC50522AS, 4d31 refers to the oven control and the wiring around it. The message is a circuit report rather than a diagnosis of one part. The…

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Code
4d31
Appliance
Microwave
Brand
Whirlpool
Warranty
30-day workmanship

What 4d31 means

On Whirlpool built-in microwaves and microwave drawers such as model WMC50522AS, 4d31 refers to the oven control and the wiring around it. The message is a circuit report rather than a diagnosis of one part. The display shows the code, and the oven may stop partway through a function or refuse to start while the condition is active. A power reset is the one thing owners should try.

Common causes of 4d31

  • Oven control board reporting a condition
  • Wiring or connector trouble near the control
  • Condition that goes away once power is cycled
✓ One safe check you can try

1. Shut off the microwave breaker. Wait one minute. 2. Turn the breaker back on. 3. Monitor the oven for one minute and confirm 4d31 does not return. 4. Verify normal operation with a short run. 5. If the code comes back, leave the oven off and call us instead of resetting again.

! Why to stop there
  • A code that returns tells us the condition is still present, so we measure the control and trace the wiring
  • You get a written quote once we know the cause
  • Workmanship is warranted for 30 days
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

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
4d314d31 questions
Why does my microwave show 4d31 partway through cooking?

The oven control or its wiring has reported a problem. Cutting power for a minute can clear a temporary one. A code that returns means the control circuit needs testing.

What should I not do when 4d31 is on the display?

Do not open the cabinet or try to remove the control. Only the breaker reset is safe for owners. Everything else we handle with the oven disconnected.

How old can a microwave be and still be repaired?

Many older built-ins are still repairable. We look at the repair cost and tell you honestly if it makes sense, instead of pushing a replacement.

Book a visit

Still seeing 4d31?

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

(713) 589-6107