Scotsman
Evaporator Freeze-Up
Unit freezes up with heavy ice on evaporator and tubing
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Safety Warning
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.
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Possible Causes
Harvest cycle not initiating, hot gas valve not opening, thermistor misreading, low airflow over condenser causing low head pressure
How to Fix / Troubleshooting
Safety: Turn off power and allow the unit to defrost completely before servicing.
- Defrost unit: Leave the machine off with doors open until all ice melts. Do not chip ice with sharp tools.
- Check hot gas valve: Ensure the valve energizes during harvest. A technician can test coil voltage and valve function.
- Inspect thermistor: Verify the evaporator thermistor is properly attached and not insulated by ice or scale.
- Clean condenser: Improve head pressure by cleaning the condenser and ensuring proper airflow.
- Test operation: After corrections, run the unit and confirm normal freeze and harvest cycles without excessive frost.
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Repair Difficulty
Hard
4/5
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