Ccu Fan; Ccu Fan; Ccu Heat; Ccu Heat - Carrier ComfortPro PC6000 Operation & Service Manual

3.5 CCU FAN

SYMPTOM
CCU fan not working
CCU fan only works on
high speed

3.6 CCU HEAT

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