F21Warning
KitchenAid Refrigerator F21 Error Code
Freezer sensor reading below range (short circuit). Can cause cooling cycle to shut down for safety.
Common causes
- Short in thermistor
- Pinched or damaged wires
- Moisture in connector
How to fix it
- Inspect freezer thermistor wiring for cuts or pinching.
- Unplug connector and check for bent pins.
- Dry connector if moisture suspected.
⚠ When to call a pro: If sensor appears shorted (very low resistance) and replacement needed.
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Always unplug the appliance (and turn off the water for washers/dishwashers) before inspecting. These guides are for information only and are not a substitute for a professional repair.