Carrier PrimeLINE - Unit will not Start or Starts then Stops; Unit Operates Long or Continuously in Cooling

T-362 6–2
Condition Possible Cause Remedy / Reference
6.1 Unit will not Start or Starts then Stops
No power to unit
External power source OFF Turn on
Start-Stop switch (ST) OFF or defective Check
Circuit breaker tripped or OFF Check
Autotransformer not connected Section 5.2.2
Loss of control power
Circuit breaker OFF or defective Check
Control transformer defective Replace
Fuse (F3A/F3B) blown Check
Start-Stop switch (ST) OFF or defective Check
Component(s) not operating
Evaporator fan motor internal protector open Section 7.17
Condenser fan motor internal protector open Section 7.12
Compressor internal protector open Section 7.9
High pressure switch open Section 6.7
Heat termination thermostat open Replace
Malfunction of current sensor Replace
Compressor hums, but does
not start
Low line voltage Check
Single phasing Check
Shorted or grounded motor windings Section 7.9
Compressor seized Section 7.9
6.2 Unit Operates Long or Continuously in Cooling
Container
Hot load Normal
Defective box insulation or air leak Repair
Refrigeration system
Shortage of refrigerant Section 7.3
Evaporator coil covered with ice Section 6.6
Evaporator coil plugged with debris Section 7.15
Evaporator fan(s) rotating backwards Section 7.17
Air bypass around evaporator coil Check
Controller set too low Reset
Compressor service valves or liquid line shutoff valve
partially closed
Open valves completely
Dirty condenser Section 7.11.1
Compressor worn Section 7.9
Current limit (function code Cd32) set to wrong value Section 4.2.2
Economizer solenoid valve malfunction Section 7.21
Digital unloader valve stuck open Replace
Electronic expansion valve Replace