Spheros CC 355 - 6.5. Troubleshooting - Failure Diagnosis Table

6.5. Troubleshooting – Failure Diagnosis Table
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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
Low suction
pressure
Lack of refrigerant Check for leakage, fill to correct amount
Air return temperature is too low Place the temperature sensor at the most appropriate
position
Dirty or defective expansion valve Clean or replace the valve
Evaporator motor is stopped Replace motor
Restriction in the system Eliminate
Loaded air filter Clean or replace filter
Dirty evaporator coil Clean coil
High
discharge
pressure
Excess refrigerant in the system Drain and capture refrigerant, fill to correct amount
Refrigerant flow obstructed Check for restriction (compressor valve partially closed,
expansion valve blocked, filter dryer blocked, etc.)
Condenser motor is stopped Refer to symptom “ Condenser motor is stopped”
Dirty condenser coil Clean and wash
For troubleshooting the following failure diagnosis table lists possible malfunctions and symptoms
and the remedial action to be taken to restore the system's serviceability.