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5
−
4
T-364
CONDITION
POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
5.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW
Evaporator coil blocked
Frost on coil
Dirty coil
No or partial evaporator air flow
Evaporator fan motor internal protector open
Evaporator fan motor(s) defective
Evaporator fan(s) loose or defective
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
Low refrigerant charge
No evaporator air flow or restricted air flow
Excessive frost on evaporator coil
Evaporator fan(s) rotating backwards
EEV control malfunction
Failed digital unloader valve (DUV)
Replace
Loose or insufficiently clamped sensor
Replace
High suction pressure with low
superheat
Foreign material in valve
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
Summary of Contents for 69NT40-561-201
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Page 108: ...7 2 T 364 Based on Drawing 62 11753 Figure 7 2 SCHEMATIC DIAGRAM ...
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