Before Calling for Service
Section 5
5-4
Safety Limit #1
Freeze time exceeds 60 minutes for 3 consecutive freeze cycles.
Because there are many possible external problems,do not limit your diagnosis to only the items listed in
these charts.
Possible Cause
Check/Correct
Improper installation
See “Installation Instructions” Section 2 of this manual
Water system
Low water pressure (20 psi minimum.)
High water pressure (80 psi maximum.)
High water temperature (90°F/32.2°C maximum.)
Clogged water distribution tube
Dirty/defective water float valve
Loss of water from sump area
Defective water pump
Electrical system
Ice thickness probe out of adjustment
Harvest cycle not initiated electrically
Compressor relay not energizing
Compressor electrically non-operational
Restricted condenser air flow
High inlet air temperature (110°F/43.3°C maximum.)
Condenser discharge air recirculation
Dirty condenser filter
Dirty condenser fins
Defective fan cycling control
Defective fan motor
Refrigeration system
Non-Manitowoc components
Improper refrigerant charge
Defective hot gas valve
Defective compressor
TXV starving or flooding (check insulation and bulb mounting)
Non-condensables in refrigeration system
Plugged or restricted high side refrigerant lines or component
