F4
Chefman
Heater Drive / Relay Fault
F4 error appears and the unit will not heat beyond low temperatures.
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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
Weak or failed heater relay on control board, Burned relay contacts, Damaged heater wiring, Partial open in heating element
How to Fix / Troubleshooting
Safety first: Unplug the fryer and wait for it to cool before opening.
- Check heater wiring: Inspect the wires from the control board to the heating element for burns or loose connections.
- Element test: Measure resistance across the heating element. A significantly higher than normal resistance may indicate partial failure.
- Control board inspection: Look at the heater relay on the PCB for discoloration or cracking. If the relay appears burnt or clicks but does not deliver power, the board should be replaced.
- Replace components: Replace the heating element if out of spec. Replace the main control PCB if the relay is faulty.
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Repair Difficulty
Professional Required
5/5
Required Part
Main Control PCB
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