6.5. Troubleshooting – Failure Diagnosis Table
39
Symptoms Probable Cause Solution
AC does not cool
down and the
compressor
remains on
Lack of refrigerant Check for leakage, fill to correct amount
Air or other gas in the system Draw a vacuum (min. 3h below 10mbar) replace filter
dryer, fill to correct amount
Dirty or defective expansion valve Replace the valve
Dirty evaporator coil Clean the coil
Air filter dirty Clean or replace filter
Cools down too
much, compressor
does not turn off
Incorrect temperature selection Adjust the temperature on the control panel
Temperature sensor badly placed Place the sensor appropriately
Condenser motor
is stopped
Electric wiring connections with no contact Repair wiring harness
Condenser motor is stopped Replace condenser motor
Burned fuse or defective relay Replace fuse and / or relay
HP switch opens Excessive refrigerant Drain and collect excess refrigerant
Condenser coil is dirty Clean the coil
Condenser motor / motors stopped Replace motors
LP switch opens Lack of refrigerant Check for leakage, fill to correct amount
Dirty or defective expansion valve Replace the valve
Dirty evaporator coil Clean the coil
Excessively contaminated air filter Replace the filter
Evaporator ventilator is stopped Replace the evaporator fan
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