70 Part Number STH044 10/13
Discharge Pressure Low Checklist
NOTE: Do not limit your diagnosis to only the items
listed in the checklists.
Problem Cause
Improper
installation
Refer to “Installation/Visual Inspection
Checklist.”
Improper
refrigerant
charge
Undercharged
Wrong type of refrigerant
Other
Low ambient temperature
Non-Manitowoc components in system
High side refrigerant lines/component
restricted (before mid-condenser)
Suction pressure is too low and affecting
discharge pressure. (Refer to “Suction
Pressure Low Checklist.”)
No water or insufficient pressure
Expansion valve incorrectly adjusted
Defective compressor
Moisture in refrigeration system
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