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Refrigeration System
• Non-Manitowoc components
• Improper refrigerant charge
• Defective head pressure control (remotes)
• Defective harvest valve
• Defective compressor
• TXV starving or flooding (check bulb mounting)
• Non-condensable in refrigeration system
• Plugged or restricted high side refrigerant lines or
component
Safety Limit #2
Refer to page 75 for control board identification and
safety limit operation.
Control Board with Black Microprocessor
- Harvest
time exceeds 3.5 minutes for 3 consecutive harvest
cycles.
or
Control Board with Orange Label on
Microprocessor - Harvest time exceeds 3.5 minutes
for 500 consecutive harvest cycles.
Possible Cause Checklist
Improper Installation
• Refer to “Installation/Visual Inspection Checklist”
Water System
• Water area (evaporator) dirty
• Dirty/defective water dump valve
• Vent tube not installed on water outlet drain
• Water freezing behind evaporator
• Plastic extrusions and gaskets not securely
mounted to the evaporator
• Low water pressure (20 psig min.)
• Loss of water from sump area
• Clogged water distribution tube
• Dirty/defective water fill valve
• Defective water pump
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