CC335/CC355
Symptoms
Possible Cause
Solution
AC does not cool and
Low on refrigerant charge
Check for leaks, adjust charge
Compressor remains on
Non-Condensables in system
Evacuate the unit to 1000 microns or less
and adjust charge to correct amount
Plugged or defective expansion valve
Replace the expansion valve
Dirty evaporator coil
Clean the coil
Dirty air filters
Clean or replace air filters
AC cools down too much and
Incorrect temperature set point selection
Adjust desired set point temperature on
Compressor continues to run
control panel
Temperature sensor location
Check and relocate temperature sensor
High discharge pressure
Overcharge of refrigerant in system
Adjust charge to correct amount
Restriction in sealed system
Locate and remove restriction, compressor
valve partially closed, expansion valve
partially closed, filter drier plugged
Condenser fan not working
Refer to symptom “Condenser Fan not
Working
”
Dirty condenser coil
Clean condenser coil
Low suction pressure
Low system charge
Check for leak, adjust charge
Return air temperature too low
Relocate temperature sensor
Plugged or defective expansion valve
Replace the expansion valve
Evaporator Blower(s) not working
Re
fer to symptom “Evaporator Blower(s) not
Working
Restriction in sealed system
Locate and remove restriction
Dirty air filters
Clean or replace air filters
Dirty evaporator coils
Clean evaporator coils
Fig. 8 Failure Diagnosis Table
19
