150 Part Number 80-1230-9 10/10
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
Starving expansion valve
Defective compressor
Moisture in refrigeration system
Defective fan cycle control
Remote condenser or remote condensing
units - Defective Head Pressure Control
Valve
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