F21Warning
Frigidaire Oven/Range F21 Error Code
The oven sensor reads an unusually low temperature, possibly indicating a faulty sensor.
Common causes
- Defective sensor
- Connector corrosion
- Wiring issue
How to fix it
- Unplug the range.
- Check sensor connector for corrosion or looseness.
- Test sensor resistance; replace if not within 1080-1120 ohms at room temp.
- Clean connector contacts with electrical contact cleaner.
⚠ When to call a pro: If the sensor and wiring are OK, the control board may be misreading.
Part links are affiliate links — as an Amazon Associate we may earn a small commission at no extra cost to you.
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.