Avanti freezer shows E3 and may not defrost properly, leading to ice buildup on the evaporator.

Safety: Unplug the freezer. Ice and water can make surfaces slippery; use towels and wear insulated gloves.

Steps:

• Defrost the unit: Allow the freezer to fully defrost so you can access the evaporator and defrost components. Do not chip ice with sharp tools; use warm air or time.
• Access evaporator area: Remove the interior rear panel to expose the evaporator coil, defrost heater, and defrost thermostat/sensor.
• Check defrost thermostat: The thermostat is usually clipped to the evaporator tubing. With the thermostat cold (below freezing), test continuity with a multimeter. It should show continuity when cold. If open when cold, replace it.
• Test defrost heater: Disconnect the heater leads and measure resistance. A typical heater will show finite resistance (e.g., 20–150 ohms). If open (OL), the heater is bad and must be replaced.
• Inspect wiring: Look for burnt connectors, brittle wires, or loose plugs between the heater, thermostat, and control board. Repair or replace as needed.
• Control board check: If thermostat and heater test good, the main control board may not be energizing the heater. Inspect the board for burnt traces or relays and replace the main control board if necessary.

After repair: Reassemble panels, restore power, and monitor for normal defrost cycles (no heavy frost buildup over several days).