
9–3
62-11785
Initiates but does not defrost
Heater contactor or coil defective
Replace
Heater(s) burned out
Evaporator fan contactor stuck closed
Check
Frequent defrost
Defrost air switch (DAS) out of adjustment
Wet load
Normal
Does not terminate or cycles on
defrost
Defrost air switch (DAS) out of adjustment
DTT malfunction
Refrigerated Compartment
Hot Load
Allow time to pull down
Defective or insufficient refrigerated compartment in-
sulation or air leak
Correct
9.2.8
Abnormal Pressure - Cooling
High discharge pressure
Condenser coil dirty
Condenser fans rotating backwards
Check Wiring
Refrigerant overcharge or noncondensibles
Discharge service valve partially closed
Open
Stuck Open Economizer Valve
Stuck Open LIV
Defective High Pressure Switch
Low discharge pressure
Low refrigerant charge
Suction modulation valve malfunction
Damaged Compressor
Compressor rotation backwards
Check Contactor Wiring
Discharge transducer circuit faulty pressure reading
Low suction pressure
Filter-drier partially plugged
Low refrigerant charge
Expansion valve malfunction
No evaporator air flow or restricted air flow
Excessive frost on evaporator coil
Suction modulation valve malfunction
Liquid or suction line service valve partially closed
Open
High suction pressure
Transducer defective
EVXV stuck open
Compressor defective
Suction and discharge pres-
sures tend to equalize when
unit is operating
Compressor rotation backwards
Check Contactor Wiring
Damaged Compressor
9.2.9
Abnormal Noise
Compressor
Loose mounting bolts
Tighten
Worn bearings
Liquid slugging
Condenser or evaporator fan
Condenser fan
Evaporator fan
9.2.10
No Evaporator Air Flow Or Restricted Air Flow
Indication/Trouble
Possible Causes
Action/Reference
Section
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