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62-11175 COMFORTPRO SERVICE MANUAL
3-11
3.5
CCU FAN
SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
CCU fan not working
•
Fuse on CCU Board
•
Check/replace
•
A-4
•
Wiring defective
•
Repair/replace
•
Capacitor defective
•
Test/replace
CCU fan only works on
•
Low speed resistor defective
•
Check/replace heating element
•
A-2
high speed
•
Resistor wiring defective
•
Repair/replace
•
A-2
•
CCU Board defective
•
Test/replace
3.6
CCU HEAT
SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
High Heat Mode does
•
Heat is not on (heat icon must be on)
•
Turn temperature setting up
•
1- 4, 1- 8
not produce warm air
•
Thermo fuse blown
•
Check/replace thermal fuse
•
A-2
•
CCU Board defective
•
Replace
Low Heat Mode does
•
Heat is not on (heat icon must be on)
•
Turn temperature setting up
•
1- 4, 1- 8
not produce warm air
•
Thermo fuse blown
•
Check/replace thermal fuse
•
A-2
•
CCU Board defective
•
Replace
Produces warm air and
•
Set point has been reached
•
Turn set point up
•
1- 4, 1- 8
gradually stops
•
High temperature cut out due to
•
Increase air flow/Increase return air
insufficient air flow
High temperature
•
High temperature cut out due to
•
Increase air flow, increase return air
sensor tripping
insufficient air flow
•
Temperature sensor wiring damaged
•
Repair/replace
•
Temperature sensor defective
•
Verify sensor operation by using
Temperature vs. Resistance Chart
•
A-11
•
Ducting blocked
•
Check and remove any blockage
Heat works OK, but
•
Driver Control Panel too close to duct
•
Remount away from ducts
•
1- 1
short cycles
•
Driver Control Panel temp sensor
•
Verify sensor operation by using
defective
Temperature vs. Resistance Chart
Heat operates long or
•
Driver Control Panel temp sensor
•
Verify sensor operation by using
continuously
defective
Temperature vs. Resistance Chart
•
A-11
•
Sleeper has an excessive heat loss
•
Cover windows, close sleeper curtains
•
Sleeper has poor insulation
•
Insulate sleeper
•
CCU air filter dirty
•
Clean/replace CCU filter
•
A-3
WARNING
Disconnect the batteries from the APU before
performing any repairs.
WARNING
Disconnect the batteries from the APU before
performing any repairs.