E4Serious
Haier Dryer E4 Error Code
The heater relay on the control board is stuck open or closed.
Common causes
- Faulty control board relay
- Heating element shorted causing relay damage
- Power surge
How to fix it
- Unplug the dryer for 10 minutes to reset the control board.
- Check the heating element continuity (should be ~10 ohms) – if shorted, replace.
⚠ When to call a pro: Call a technician if the error persists after reset, as control board replacement is likely 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.