128 Part Number STH034 3/12
Suction Pressure/Temperature Low Checklist
Problem Cause
Improper
installation
Refer to Installation procedures.
Discharge
pressure/
temperature
Discharge pressure/temperature is too
low and is affecting suction pressure/
temperature. Refer to “Discharge
Pressure/Temperature Low Checklist.”
Improper
refrigerant
charge
Undercharged
Wrong type of refrigerant
Other Non-Manitowoc components in system
Restricted/plugged liquid line drier
Restricted/plugged tubing in suction side
of refrigeration system
Expansion valve starving
No water or insufficient pressure
Moisture in refrigeration system
Dirty Evaporator
Defective Fan Cycle Control
NOTE: Do not limit your diagnosis to only the items
listed in the checklists
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