F4
Haier
Heater Relay or Triac Fault
Haier dryer displays F4 and does not heat or overheats quickly
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Stuck heater relay on main board, Open heater relay coil, Shorted triac (on electronic heater control), Burnt solder joints on control board
How to Fix / Troubleshooting
Safety first: Unplug the dryer. Live testing of relays should only be done by qualified personnel.
- Visual inspection: Remove the control panel to access the main board. Look for burnt areas near the heater relay or power components.
- Check relay operation: With the dryer unplugged, inspect the heater relay for signs of melting or discoloration. If the relay contacts are welded closed, the heater may stay on continuously.
- Test heater circuit: Use a multimeter to verify that the heater is not energized when the dryer is off (requires careful live testing by a professional).
- Replace control board: In most cases, the heater relay or triac is integrated into the main board and not serviceable separately. Replace the main control board if F4 persists.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control Board
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