62-11785 9–4
Evaporator coil blocked
Frost on coil Section 8.7.12
Dirty coil Section 8.7.1
No or partial evaporator air flow
Evaporator fan rotating backwards Section 8.8.10
Evaporator fan defective Section 8.8.10
Evaporator air flow blocked Check
9.2.11 Expansion Valve (EVXV) Malfunction
EVXV not controlling correctly
Low refrigerant charge Section 8.5.2
EVOT defective Section 8.8.14
Coil not seated properly on valve Section 8.7.11
Valve / Valve Coil defective Section 8.7.8
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 Section 8.7.7
CSP defective Section 8.7.11
CST defective Section 8.8.14
Damaged or corroded electrical connections at valve
or SVM
Check/Repair
Stepper Valve Module (SVM) Check Section 2.5.4
Repair Section 8.8.3
9.2.13 Economizer Valve (ECXV) Malfunction
ECXV not controlling correctly
Coil not seated properly Check
Valve / Valve Coil defective Section 8.7.8
ECOT defective Section 8.8.14
Damaged or corroded electrical connections at valve
or SVM
Check/Repair
Stepper Valve Module (SVM) Check Section 2.5.4
Repair Section 8.8.3
Stuck open LIV Section 8.7.9
9.2.14 Abnormal Discharge Temperature (High)
Refrigeration system
Plugged LIV strainer, or defective LIV Section 8.7.9
Defective CDT Section 8.8.13
Low refrigerant charge Section 8.5.2
Non-Condensables Section 8.5.2
Damaged Compressor Section 8.6
Indication/Trouble Possible Causes Action/Reference
Section