72 Part Number 000015432 Rev02 5/21
Discharge Pressure Low Checklist
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
NOTE: Do not limit your diagnosis to only the items listed
in the checklists.
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