Whirlpool Range 4d21 — What It Means & How to Fix It
Also shown as 4d22 on some models.
4d21 and 4d22 mean the cooling fan speed is too low — look for blocked airflow, reset the breaker for one minute, and call service if the code repeats.
What this code means
Whirlpool describes 4d21 and 4d22 as cooling fan speed too low, with a possible airflow restriction, oven cooling fan fault, or wiring fault.
The F#E# equivalent is F8 E0. Fan speed too high is 4d41/4d42.
Most likely causes
| Cause | How likely | DIY-fixable? |
|---|---|---|
| Airflow restricted at the vents | Common | Yes — no tools |
| Cooling fan failing | Common | No — technician job |
| Wiring fault | Occasional | No — technician job |
What you can try yourself
- Let the oven cool and uncover any vents.
- Breaker(s) off for one minute, then on.
- Run the oven and listen for the fan.
- Schedule service if the code returns.
When to call a technician
- Code with vents clear.
- Fan silent or noisy.
- Console very hot.
Typical professional repair cost: Around $150–$300 for a cooling fan.
Frequently asked questions
What does 4d21 mean on a Whirlpool range?
Whirlpool describes it as cooling fan speed too low, possibly from an airflow restriction, the oven cooling fan, or its wiring.
What can I check myself for 4d21?
Airflow. Make sure nothing covers the oven vent or the openings around the console, then reset power for one minute.
Is 4d22 the same as 4d21?
Whirlpool gives 4d22 the same cooling-fan-speed-too-low explanation.
Sources checked
Error meanings can vary by model. This guide was checked against the documentation above; use the manual for the model number on your own appliance when it differs.
Related Whirlpool codes
- Whirlpool Range F3 E0 F3 E0 on a Whirlpool-family range flags the oven temperature sensing circuit — Whirlpool's own description names the temperature sensor, the control, or the associated wiring. A one-minute breaker reset is the official first step.
- Whirlpool Range F3 E1 F3 E1 is the paired partner of F3 E0 on Whirlpool-family ranges: the same oven temperature sensing circuit, control, or wiring suspects, per Whirlpool's own page. A one-minute breaker reset is the official first step.
- Whirlpool Range F1 E0 F1 E0 on a Whirlpool-family range points at the oven control — Whirlpool's own page names the oven control or the associated wiring. A one-minute breaker reset is the official first step.
- Whirlpool Range F2 E0 F2 E0 on a Whirlpool-family range points at the user interface, the keypad, the control, or the wiring — the input side of the oven. Clean keys and a one-minute breaker reset first.
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