5−4T-364
CONDITION POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
5.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Evaporator coil blocked
Frost on coil 5.6
Dirty coil 6.13
No or partial evaporator air flow
Evaporator fan motor internal protector open 6.14
Evaporator fan motor(s) defective 6.14
Evaporator fan(s) loose or defective 6.14
Evaporator fan contactor defective Replace
5.11 ELECTRONIC EXPANSION VALVE MALFUNCTION
Low suction pressure
Incorrect software and/or controller configuration Check
Failed suction pressure transducer (SPT) or evaporator
pressure transducer (EPT)
Replace
Suction service valve partially closed Open
Filter drier partially plugged 6.12
Low refrigerant charge 6.3
No evaporator air flow or restricted air flow 6.13
Excessive frost on evaporator coil 5.6
Evaporator fan(s) rotating backwards 6.14.3
EEV control malfunction 6.16
Failed digital unloader valve (DUV) Replace
Loose or insufficiently clamped sensor Replace
High suction pressure with low
superheat
Foreign material in valve 6.16
Failed suction pressure transducer (SPT) or evaporator
pressure transducer (EPT)
Replace
EEV control malfunction Replace
Improperly seated powerhead
Ensure power-
head is locked
and in place
Liquid slugging in compressor
Failed suction pressure transducer (SPT) or evaporator
pressure transducer (EPT)
Replace
Failed EEV Replace
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