Error code “Er dH” and heavy frost buildup on the evaporator; refrigerator may be warm.

Safety: Unplug the refrigerator before accessing the evaporator or heater. Avoid contact with sharp evaporator fins.

• Defrost manually: Remove freezer contents and interior rear panel. If the evaporator is encased in ice, use a hair dryer on low and towels to melt and absorb water. Do not chip ice with sharp tools.
• Locate heater and thermostat: The defrost heater is usually a metal or glass tube at the bottom of the evaporator; the thermostat is clipped to the coil.
• Test heater: Disconnect heater leads and measure resistance. An open circuit indicates a failed heater.
• Test thermostat: When cold (below freezing), the thermostat should show continuity. If open when cold, replace it.
• Inspect wiring: Check for burnt connectors or broken wires in the defrost circuit.
• Control board: If heater and thermostat are good, the main PCB may not be initiating defrost and may need replacement.