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www.manitowocfsusa.com 800-225-9916 23
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:
Warranty Information
For information regarding warranty guidelines, claim form, product registration, warranty
verification, or locating a service provider please visit our website at
www.manitowocfsusa.com or call 1-800-225-9916.
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