F38Serious
Bosch Washer F38 Error Code
Water not heating or overheating; heater relay or NTC issue.
Common causes
- Faulty heating element
- NTC thermistor defective
- Relay on control board
How to fix it
- Unplug washer
- Check wiring to heating element
- Measure resistance of heating element (should be ~30 ohms)
⚠ When to call a pro: If heating element resistance OK, or error persists
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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.