Troubleshooting - Carrier 69NT40--541--200 TO 299 Operation And Service

CONDITION
5.1 UNIT WILL NOT START OR STARTS THEN STOPS
No power to unit
Loss of control power
Component(s) Not Operating
Compressor hums, but does not
start
5.2 UNIT OPERATES LONG OR CONTINUOUSLY IN COOLING
Container
Refrigeration System
SECTION 5

TROUBLESHOOTING

POSSIBLE CAUSE
External power source OFF
Start-Stop switch OFF or defective
Circuit breaker tripped or OFF
Autotransformer not connected
Circuit breaker OFF or defective
Control transformer defective
Fuses (F3A , F3B) blown
Start-Stop switch OFF or defective
Evaporator fan motor internal protector open
Condenser fan motor internal protector open
Compressor internal protector open
High pressure switch open
Heat termination thermostat open
Low line voltage
Single phasing
Shorted or grounded motor windings
Compressor seized
Hot load (Failure to Pre--cool)
Defective box insulation or air leak
Shortage of refrigerant
Evaporator coil covered with ice
Evaporator coil plugged with debris
Evaporator fan(s) rotating backwards
Defective evaporator fan motor/capacitor
Air bypass around evaporator coil
Controller set too low
Compressor service valves or liquid line shutoff valve par-
tially closed
Dirty condenser
Compressor worn
Current limit (function code Cd32) set to wrong value
Suction modulation valve malfunction
5-1
REMEDY/
REFERENCE
SECTION
Turn on
Check
Check
4.2.2
Check
Replace
Check
Check
6.16
6.11
6.8
5.7
Replace
Check
Check
6.8
6.8
Normal
Repair
6.7.1
5.6
6.15
6.15/6.16
6.17
Check
Reset
Open valves
completely
6.10
6.8
3.3.5
6.18
T-317