Unit Will Not Terminate Cooling; Unit Will Not Heat Or Has Insufficient Heating; Unit Will Not Terminate Heating; Defrost Cycle Malfunction - Carrier VECTOR 6500 Operation & Service Manual

Indication/Trouble

9.4.4 Unit Will Not Terminate Cooling

Unit fails to stop cooling
9.4.5

Unit Will Not Heat Or Has Insufficient Heating

Unit will not heat or has insuffi-
cient heat

9.4.6 Unit Will Not Terminate Heating

Unit fails to stop heating

9.4.7 Defrost Cycle Malfunction

Will not initiate defrost
automatically
Will not initiate defrost manually
Initiates but does not defrost
Frequent defrost
Does not terminate or
cycles on defrost.
Refrigerated Compartment
Possible Causes
Temperature sensor malfunction
Contactor (CCON) stuck closed
Microprocessor improperly set
Heater(s) defective
Heater contactors or coil defective
Defective wiring / connectors
Loose terminal connections
Low voltage
No or restricted air flow
Temperature sensor malfunction
Compressor contactor stuck closed
Microprocessor temperature improperly set
Microprocessor malfunction
Temperature sensor malfunction
Defrost timer has not expired
Defrost air switch (DAS) malfunction
DTT is above 40_F (4.4_C)
Loose terminal connections (DAS)
Keypad defective
Loose terminal connections between keypad and micro-
processor
DTT is above 40_F (4.4_C)
Unit has been running less than 15 seconds
Heater contactor or coil defective
Heater(s) burned out
Evaporator fan contactor stuck closed
Defrost air switch (DAS) out of adjustment
Wet load
Defrost air switch (DAS) out of adjustment
DTT malfunction
Hot Load
Defective or insufficient refrigerated compartment insula-
tion or air leak
9−5
Action/Refer-
ence Section
8.9.10
Check
Check set point
Check whether
microprocessor
is set at °C or
°F
8.9.5
Replace
Replace
Tighten
9.3
9.4.10
8.9.10
Check
Reset
9.6
8.9.10
Check/Reset
8.8.9
Cool Down
Tighten
8.4.4
Tighten
Cool Down
Try again
Replace
8.9.5
Check
8.8.9
Normal
8.8.9
8.9.10
Allow time to
pull down
Correct
62-11389