Washer-dryer shows E66; heating does not start or stops unexpectedly.

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.

Possible Causes

Stuck or burnt heater relay on PCB, PCB track damage, Overheated relay contacts, Incorrect replacement board

Safety: Unplug the appliance.

Confirm heater health: Test both wash and dryer heaters to ensure they are not shorted and have correct resistance.
Inspect PCB: Look for a burnt or cracked relay in the heater control section. Check for discoloured PCB around it.
Replace PCB: In most cases, the entire control board must be replaced to resolve E66.

Professional Required 5/5

Main Control Board (PCB)

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