126 Part Number STH034 3/12
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 procedures.
Improper
refrigerant
charge
Undercharged
Wrong type of refrigerant
Other
Low ambient temperature
High side refrigerant lines/component
restricted (before mid-condenser)
Suction pressure is too low and affecting
discharge pressure. (Refer to “Suction
Pressure/Temperature Low Checklist.”)
No water or insufficient pressure
Starving expansion valve
Defective compressor
Moisture in refrigeration system
Defective fan cycle control
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