62-11785
9–4
Evaporator coil blocked
Frost on coil
Dirty coil
No or partial evaporator air flow
Evaporator fan rotating backwards
Evaporator fan defective
Evaporator air flow blocked
Check
9.2.11
Expansion Valve (EVXV) Malfunction
EVXV not controlling correctly
Low refrigerant charge
EVOT defective
Coil not seated properly on valve
Valve / Valve Coil defective
EVOP defective
Check
EVXV inlet screen plugged
Check/Replace
Damaged or corroded electrical connections at valve
or EVXV
Check/Repair
9.2.12
Compressor Suction Modulation Valve (CSMV) Malfunction
CSMV not controlling correctly
Coil not seated properly
Check
Coil defective
CSP defective
CST defective
Damaged or corroded electrical connections at valve
or SVM
Check/Repair
Stepper Valve Module (SVM)
Check
Repair
9.2.13
Economizer Valve (ECXV) Malfunction
ECXV not controlling correctly
Coil not seated properly
Check
Valve / Valve Coil defective
ECOT defective
Damaged or corroded electrical connections at valve
or SVM
Check/Repair
Stepper Valve Module (SVM)
Check
Repair
Stuck open LIV
9.2.14
Abnormal Discharge Temperature (High)
Refrigeration system
Plugged LIV strainer, or defective LIV
Defective CDT
Low refrigerant charge
Non-Condensables
Damaged Compressor
Indication/Trouble
Possible Causes
Action/Reference
Section
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