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II. A/C System Diagnosis and Troubleshooting
Table 1
Abnormal high pressure of the high pressure pipeline
Abnormal low pressure of the high pressure pipeline
Abnormal high pressure of the low pressure pipeline
Abnormal low pressure of the low pressure pipeline
High and low pressure can not be established
Sight glass has air bubble
Compressor inlet side is frosted
Compressor noise
Abnormal heating on the compressor
Evaporator is frosted
Drier filter ices up
A/C does not refrigerate or the cold air is insufficient
× × × × Excessive refill of refrigerant
Drain proper amount of
refrigerant
× × × × Too little refill of refrigerant
Repair the gas leak area, refill
proper amount of refrigerant
× × × × Refrigerant is leaked all
Repair the gas leak area, refill
proper amount of refrigerant
×× ××× ×
There is non-clotted gas in
the system
Loosen receiver and
condenser inlet connector,
discharge the non-clotted gas
××
Excessive freezing oil in the
system
Check compressor freezing
oil level, adjust it
×
Excessive high temperature
of condenser inlet
Perform the check at the
place with good ventilation
There is dust in the
condenser core, air channel
within the condenser is
blocked or suffocated
Use compressed air or water
to flush and remove the dirt
on the condenser
Condenser fan faulty or
broken
Check the wiring status and
the fan motor, correct or
rep lace it
××
Excessively low temp erature
of condenser inlet
Stop the operation of the
refrigeration system
× × × Drier blocked Clean
Air channel in the evap orator
blocked or suffocated
Remove the dirt on the
evaporator
Evaporator fan fault, poor
blower motor wire connection
Check the wiring status and
the fan motor, correct or
rep lace it
×× ×
There is dirt in evap orator
core
Use the compressed air to
clean the evaporator core
×
×
×××
×
×
Problem Symptom
Possible Cause Troubleshooting
×
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