19 62-11850
Low suction pressure No evaporator air flow or restricted air flow.
Excessive frost on coil.
Suction service valve partially closed.
Filter-drier partially plugged.
Low refrigerant charge.
Expansion valve malfunction.
Suction and discharge
pressure tend to equalize
when unit is operating.
Compressor valves defective.
Hot gas (two-way) solenoid malfunction.
Heating Mode
Unit will not heat or
insufficient heating
Abnormal pressure.
Temperature controller malfunction.
Hot gas (two-way) solenoid malfunction.
Compressor drive belt broken.
Compressor defective.
High discharge pressure Overcharged system.
Condenser fan of HP2 pressure switch
defective.
Non-condensibles in system.
Condenser fan defective or no air flow
through Condenser.
Low discharge pressure Compressor valve(s) worn or broken.
Hot gas (two-way) valve malfunction.
Low suction pressure Refrigerant shortage.
Compressor pressure regulating valve
malfunction.
Defrost Mode
Automatic defrost will
not initiate
Defrost thermostats (DTT) open or
defective.
Hot gas valve.
Electronic card malfunction.
Manual defrost will not
initiate
Microprocessor defective.
Defrost thermostat (DTT) open or defective.
Defrost cycle initiates
but does not defrost
Hot gas (two-way) solenoid malfunction.
Frequent defrost Wet load.
Does not terminate or
cycles on defrost
Defrost thermostat (DTT) shorted closed.
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