72 Part Number STH044 10/13
Suction Pressure Low Checklist
Problem Cause
Improper
installation
Refer to “Installation/Visual Inspection
Checklist.”
Discharge
pressure
Discharge pressure is too low and is
affecting suction pressure. Refer to
“Discharge Pressure 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
NOTE: Do not limit your diagnosis to only the items
listed in the checklists
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