Carrier NDK33BN0KB, Operation & Service Manual

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62-61753-21 10-9
INDICATION/
TROUBLE
POSSIBLE CAUSES
REFERENCE
SECTION
10.4.12 Solenoid Valve Malfunction
Solenoid valve does not function
properly No power to valve Check
Improper wiring or loose connections Check
Coil defective 8.6.9
Valve improperly assembled 8.6.9
Coil or coil sleeve improperly assembled 8.6.9
Movement of plunger restricted due to:
a. Corroded or worn parts
b. Foreign material lodged in valve
c. Bent or dented enclosing tub 8.6.9
Solenoid valve closes but
refrigerant continues to flow Foreign material lodged under seat
Clean/8.6.9
Defective seat
Replace/8.6.9
10.4.13 Economizer System Malfunction
Solenoid valve does not function
properly Check valve 9.4.12
Thermostatic expansion valve
does not function properly Service valve 8.6.10
Economizer heat exchanger does
not function properly Service economizer heat exchanger 8.6.4