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62-11175 COMFORTPRO SERVICE MANUAL
3-9
SYMPTOM
PROBABLE CAUSE
SOLUTION
REFERENCE
Condenser fan not
•
A/C is not on
•
Set temperature to lower setting
•
1- 4, 1- 8
working
•
DC power fuse blown
•
Determine reason and replace fuse
•
A-4
•
Wiring damaged
•
Repair/replace
•
Fan defective (seized)
•
Replace
Compressor will not
•
High pressure switch open
•
See "Tripped high pressure switch"
•
3- 8
start
(no hum)
•
Evaporator frozen
•
See "Produces cold air and
•
3- 8
gradually stops"
•
Five minute timer active
•
Wait five full minutes
•
Overload protector tripped
•
Let unit cool down, check for
•
2- 1
low refrigerant
•
Driver Control Panel not calling for A/C
•
Set temperature to lower setting
•
Compressor seized
•
Replace compressor
Compressor will not
•
Low A/C Voltage to CCU
•
See "Generator" section
•
3- 6
start
(hums)
•
Starting capacitor defective
•
Determine reason and replace
•
Potential relay is open
•
Determine reason and correct,
replace if necessary
•
Compressor motor winding open
•
Replace compressor
or shorted
•
Internal mechanical trouble
•
Replace compressor
in compressor
Compressor will not
•
Low A/C Voltage to unit
•
See "Generator" section
•
3- 6
start
(hums but trips
•
Potential relay is failing to open
•
Determine reason and correct,
on overload protection)
replace if necessary
•
Run capacitor is defective
•
Determine reason and replace
•
Excessively high discharge pressure
•
Check high pressure switch, possible
overcharge or insufficient cooling on
condenser (fan)
•
Compressor motor has a winding
•
Replace compressor
open or shorted
•
Internal mechanical trouble in
•
Replace compressor
compressor (tight)
Compressor starts and
•
Low voltage to unit
•
See "Generator" section
•
3- 6
runs, but short cycles
•
Overload protector defective
•
Check current and replace protector
on overload protector
•
Run capacitor is defective
•
Determine reason and replace
•
Excessively high discharge pressure
•
Check condenser (fan) and for
restriction in refrigeration lines
•
Compressor too hot – suction
•
Check refrigerant charge (check for
•
2- 1
line hot
leaks) and add if necessary
•
Compressor motor has a
•
Replace compressor
winding shorted
Air conditioner runs
•
Overload protector
•
See "Compressor starts and runs, but
•
3- 9
OK, but short cycles
short cycles on overload protector"
•
Driver Control Panel too close
•
Remount away from ducts
•
1- 1
to ducts