E5 error and freezer interior warms up periodically, ice may melt and refreeze

Safety first: Disconnect power. The defrost heater can be sharp and may have glass or metal elements.

Steps:

• Remove the inner rear panel to expose the evaporator and defrost heater assembly.
• Locate the defrost heater (usually a metal or glass-encased element running along the bottom or woven through the evaporator).
• Inspect for visible breaks, burn marks, or disconnected wires.
• Use a multimeter to test the heater for continuity. An open circuit indicates a failed heater that must be replaced.
• Check the wiring harness from the heater to the main control board for burns or loose connectors.
• If the heater and wiring are good, the defrost relay or triac on the main control board may be defective; replace the board if confirmed.