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62-11175 COMFORTPRO SERVICE MANUAL
3-8
SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
Does not produce
•
Refrigerant leaked out
•
Check for leaks and repair
•
2-3
cold air
•
Compressor not working
•
Check voltage at compressor
•
Inlet filter clogged
•
Clean filter
•
A-3
Produces cold air and
•
Evaporator blocked with ice
•
Increase air flow, increase return air
gradually stops
•
Low refrigerant charge
•
Check for leaks and repair
•
2-1
•
Air Duct blocked
•
Check and remove any blockage
Tripped high
•
Condenser fan not working
•
See "Condenser fan not working"
•
3-9
pressure switch
•
Condenser is dirty
•
Clean
•
Poor air flow around condenser
•
Check condenser location, relocate
if necessary
•
Refrigerant is over charged
•
Reduce charge to 64–68 oz
•
2-1
Tripped on EVAP
•
Evaporator blocked with ice
•
Increase air flow, increase return air
temp sensor
•
Low refrigerant charge
•
Check for leaks and repair
•
2-1
•
EVAP temp sensor faulty
•
Verify sensor operation by using
Temperature vs. Resistance Chart
•
2-3
3.4
CCU AIR CONDITIONING
Each symptom is followed by a probable cause and suggested solution. To isolate the
possible cause, proceed in a systematic manner to determine the faulty component. This
guide does not cover all possible situations that may occur under all conditions of operation.
NOTE:
The five minute timer is activated any time the compressor is turned off (by the
thermostat, EVAP temp sensor or high pressure switch. It is used to let the pressure
between the high and the low side equalize so that the compressor can start under a
"no load" condition.
WARNING
Disconnect the batteries from the
APU before performing any repairs.