Display shows E5 and the refrigerator may not defrost, leading to heavy ice buildup and poor cooling.

Safety first: Unplug the refrigerator before testing the heater or removing panels. The defrost heater operates at mains voltage.

Access the defrost system:

• Remove freezer drawers and the rear panel to expose the evaporator and heater.
• Locate the defrost heater (usually a metal or glass-encased element at the bottom or woven through the evaporator).

Testing:

• Disconnect heater leads and measure resistance with a multimeter. An open circuit indicates a failed heater.
• Check the defrost thermostat/thermal fuse (if fitted) for continuity when cold; it should be closed.
• Inspect wiring for burns or breaks.

Corrective action: Replace any open heater or failed thermostat/fuse with the correct Hotpoint part. If all components test good but E5 remains and the unit does not defrost, the main control board is likely at fault and should be replaced.