Hoshizaki
Evaporator Freeze-Up / Ice Build-Up
Unit frequently freezes up with ice bridging on evaporator, requiring manual defrost
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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 completing, Scale buildup on evaporator, Faulty hot gas valve, Incorrect freeze/harvest timing
How to Fix / Troubleshooting
Safety First: Disconnect power and allow ice to melt or use warm water; do not use sharp tools on the evaporator.
- Defrost completely: Remove all ice from the evaporator and bin. Use warm water to melt remaining ice.
- Descale evaporator: Clean with nickel-safe cleaner to remove scale that can trap ice.
- Check hot gas valve: Ensure the valve coil is energized during harvest and that the valve is not stuck closed. Replace coil or valve if defective.
- Observe harvest: After cleaning, watch a full cycle to confirm cubes release fully. If not, harvest timing or sensors may need adjustment.
When to call a technician: Persistent freeze-up after cleaning suggests a control or sealed system issue.
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Repair Difficulty
Hard
4/5
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