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Problem
Possible causes
Dirty evaporator.
Lack of refrigerant.
Low water flow.
Expansion valve malfunction or failure.
Low suction
pressure.
Solenoid value not open.
Liquid line filter drier fouled.
Condensing temperature too low.
Excess oil used.
Voltage unbalance or out of range.
Motor overload
Faulty or grounded wiring on motor.
relays or circuit
breakers open.
Loose power wiring or faulty contactors.
High condenser temperature.
Operation beyond design conditions.
Compressor
Voltage range or unbalance.
thermal
protection switch
High overheating.
open.
Short cycling.
iom-clicsa-cf-eng
Troubleshooting Chart
Possible corrective actions
Backwashing or chemical cleaning.
Check for leaks, repair and add the necessary charge.
Check liquid sight glass.
Adjust the water flow required for the equipment.
Check or replace (if necessary) the valve and adjust the proper
superheat.
Check circuit and possible problem of solenoid valve not opening,
if necessary replace.
Check pressure drop or temperature for diagnostics.
Check means of regulating condenser temperature.
If the system has excess oil, recover and adjust by observing the
sight glass on the compressor.
Correct power supply.
Check electrical circuit for possible problem. Then replace
compressor.
Check all connections and tighten, if necessary replace contactors.
See corrective steps for high discharge pressure.
Correct to bring conditions within allowable limits.
Check and correct.
Set correct superheat. Check for possible problem. Then replace
the compressor.
Check and stabilize load or correct control settings for the
application.
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