74 Part Number 000015432 Rev02 5/21
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 checklist.
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