Valeo Aerosphere World, Operating Instructions Manual, Page: 45 / 61

Aerosphere World / Midibus
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6 Failure Diagnosis Table
For troubleshooting the following Fig. lists possible malfunctions and
symptoms and the remedial action to be taken to restore the system's
serviceability.
Symptoms Probable cause Solution
Compressor does not work Fuse or relay defective Replace fuse or relay
Magnetic clutch burned Repair or replace clutch
Compressor blocked Repair or replace compressor
Low pressure switch open Lack of gas on system or defective low pressure switch
HP switch opens Excessive refrigerant Drain and collect refrigerant excess
Condenser coil is dirty Clean the coil
Condenser motor/motors stopped Repair or replace motors
LP switch opens Lack of refrigerant Check for leakage, fill to correct amount
Dirty or defective expansion valve Clean or replace the valve
Dirty evaporator coil Clean the coil
Excessively contaminated air filter Clean or replace the filter
Evaporator ventilator is stopped Replace the evaporator fan
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
Fig. 10 Failure Diagnosis Table