F03Warning
Bosch Dryer F03 Error Code
The temperature sensor (NTC) is reading incorrectly or disconnected, causing inaccurate temperature control.
Common causes
- Faulty NTC thermistor
- Loose wiring to NTC sensor
- Control board communication error
How to fix it
- Check wiring connections to the NTC sensor (usually near heater).
- Measure resistance of NTC sensor at room temperature (should be around 10-20 kΩ).
- Unplug dryer for 10 minutes to reset control board.
⚠ When to call a pro: If sensor resistance is out of range or wiring intact, replace the NTC sensor.
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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.