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6–3
T-359
Unit will not heat or
has insufficient heat
Heater(s) defective
Heater contactor or coil defective
Replace
Evaporator fan motor(s) defective or rotating backwards
Evaporator fan motor contactor defective
Replace
Controller malfunction
Defective wiring
Replace
Loose terminal connections
Tighten
Low line voltage
6.5
UNIT WILL NOT TERMINATE HEATING
Unit fails to stop heating
Controller improperly set
Reset
Controller malfunction
Heater termination thermostat remains closed
along with the heat relay
6.6
UNIT WILL NOT DEFROST PROPERLY
Will not initiate defrost
automatically
Defrost timer malfunction (Cd27)
Loose terminal connections
Tighten
Defective wiring
Replace
Defrost temperature sensor defective or heat
termination thermostat open
Replace
Heater contactor or coil defective
Replace
Will not initiate
defrost manually
Manual defrost switch defective
Replace
Keypad is defective
Replace
Defrost temperature sensor open
Replace
Initiates but relay
(DR) drops out
Low line voltage
Initiates but does not defrost
Heater contactor or coil defective
Replace
Heater(s) burned out
Frequent defrost
Wet load
Normal
6.7
ABNORMAL PRESSURES
High discharge pressure
Condenser coil dirty
Condenser fan rotating backwards
Condenser fan inoperative
Refrigerant overcharge or noncondensibles
Discharge service valve partially closed
Open
Electronic expansion valve (EEV) control malfunction
Replace
CONDITION
POSSIBLE CAUSE
REMEDY/
REFERENCE
SECTION
Summary of Contents for 69NT40-561-019
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Page 127: ...8 3 T 359 Figure 8 2 SCHEMATIC DIAGRAM Evergreen Unit Configuration ...
Page 128: ...T 359 8 4 Figure 8 3 UNIT WIRING DIAGRAM Evergreen Unit Configuration Sheet 1 of 2 ...
Page 129: ...8 5 T 359 Figure 8 4 UNIT WIRING DIAGRAM Evergreen Unit Configuration Sheet 2 of 2 ...
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