Freezer cold but refrigerator warm, ice buildup on back wall of freezer.

Safety first: Unplug the refrigerator and prepare towels for melting ice.

Defrost the evaporator:

• Empty the freezer and remove the rear interior panel.
• Allow all ice to melt naturally or use a hair dryer on low, keeping it away from plastic parts and wiring.

Component checks:

• Inspect the defrost heater at the base of the evaporator for breaks or burn marks.
• Test the heater and defrost thermostat for continuity with a multimeter.

Repair: Replace any failed defrost components with Summit-compatible parts. After repair, reassemble panels and monitor for proper cooling and absence of new frost buildup.