Sub-Zero Evaporator Frost / Ice Buildup

Visible frost or ice buildup on the evaporator plate or nearby tubing.

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Improper defrost/harvest, Low refrigerant charge, Restricted airflow, Thermistor misreading evaporator temperature

Safety: Disconnect power before defrosting. Do not use sharp tools to remove ice.

Steps to address frost:

1. Manual defrost: Turn off the unit and allow ice to melt naturally. Place towels to catch water.
2. Clean condenser and ensure airflow: Overheating can affect defrost performance.
3. Run cleaning cycle: Remove scale that may interfere with proper harvest.
4. Thermistor and control: If frost returns quickly, a technician should test the evaporator thermistor and harvest/hot gas valve operation.

Hard 4/5

Evaporator Thermistor

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