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Error code · Range

Whirlpool Range Code 4D21: Slow Cooling Fan in the Oven

On Whirlpool freestanding and slide-in ranges, such as the WFE515S0ES or WFG515S0ES, 4D21 means the oven cooling fan speed looks too low to the control. The fan keeps the control area from overheating while the oven…

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Code
4d21
Appliance
Range
Brand
Whirlpool
Warranty
30-day workmanship

What 4d21 means

On Whirlpool freestanding and slide-in ranges, such as the WFE515S0ES or WFG515S0ES, 4D21 means the oven cooling fan speed looks too low to the control. The fan keeps the control area from overheating while the oven works. The control suspects an airflow restriction, the cooling fan, or the wiring. You may hear a weak fan, or the oven may stop heating with 4D21 on the display.

Common causes of 4d21

  • An airflow restriction around or inside the range
  • The oven cooling fan
  • Wiring and plugs to the fan
✓ One safe check you can try

1. Let the range cool, then check that nothing blocks the vent openings at the range. 2. Turn the range's breaker off for one full minute. 3. Turn it back on. 4. Run a short bake and listen for the fan. 5. If 4D21 shows again, stop baking and call us.

! Why to stop there
  • A weak fan may be dust, a failing motor, or a wire, and a reset cannot say which.
  • We check airflow and fan speed with the range powered down and then running.
  • The price is given in writing first, and our repair has 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 Range codes

PUSH or PSHWhirlpool Range PUSH or PSH: Start Was Not Pressed Sabbath ModeWhirlpool Range Sabbath Mode: Why the Oven Stays On Sabbath, Sab, 5Ab, or 5A7Whirlpool Range Sabbath, Sab, 5Ab or 5A7: Canceling the Mode LOCLOC on a Whirlpool Range or Wall Oven: Control Lock Is On LockWhirlpool Range Cooktop Lock: Unlocking the Surface Controls PowerLossWhirlpool Range and Wall Oven PowerLoss: Reset the Time Press Cancel to ResetWhirlpool Range Message "Press Cancel to Reset": What to Do Probe or Insert ProbeWhirlpool Range Probe Message: Meat Probe Not Detected
4d214d21 questions
Why does the oven need a cooling fan?

It moves air around the control and the oven's outer parts so they stay at a safe temperature. If it runs slowly, the control may shut heating off to protect itself.

Can I clean the fan myself?

You can clear the vent openings you can see from outside. We do not ask owners to open panels or reach inside the range. The fan housing itself is not something to reach for.

Does 4D21 mean the fan motor failed?

Not always. A restriction or a wire can slow a fan too. We test those before suggesting a motor. That order keeps your repair price lower.

Book a visit

Still seeing 4d21?

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

(713) 589-6107