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Condensing Unit Troubleshooting Chart (continued):
Problem
Possible Cause
Corrective Action
High suction pressure Excessive load Reduce load or add additional
equipment
Expansion valve overfeeding
Secure and insulate TXV bulb or
if required adjust superheat.
Low suction pressure
Lack of refrigerant
Locate and repair leak, recover,
evacuate and charge.
Evaporator dirty or iced
Clean
Clogged liquid line or suction line
filter-drier
Replace filter-drier
Expansion valve malfunctioning
Check and reset for proper
superheat
Condensing temperature too low
Check head pressure control
Improper TXV
Check for proper sizing
Compressor loses oil
Lack of refrigerant
Locate and repair leak, recover,
evacuate and recharge
Excessive compression ring
blow-by
Replace compressor
Refrigerant flood back
Maintain proper superheat at
compressor
Improper piping or traps
Correct piping
Compressor thermal protector
switch open
Operating beyond design
Add facilities so that operating
conditions are within allowable
limits
Discharge valve partially shut
Open valve
Dirty condenser coil
Clean coil
Overcharged system
Correct charge
Notes:
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