Gree GWC09KF-K3DNA5A Service Manual page 46

Troubleshooting
(3) Temperature sensor malfunction
Main detection point:
Is outdoor ambient temperature within the normal range?
Is indoor and outdoor fan running normally?
Is the radiating environment inside and outside the unit good enough?
Malfunction diagnosis process:
Energize the
unit and start it
Voltage between
L and N of
indoor wiring
block
Check the
connecting
Y
state of the
Voltage > 200V?
connecting
terminal
N
Check power
supply
Energize the
unit and start
it
Indoor unit
Y
display F1/F2
N
Indoor unit
display F4/F5
Y
Check connecting
state of outdoor
temperature sensor
Reliable
N
connected?
connecting state
Y
Replace
temperature N
sensor?
Remove error?
N
Y
Replace parts
of outdoor
electric box
Reliable
N
connection
Y
Replace main
N
board of indoor
unit
Remove the
N
error?
Replace motor
Finish
Check connecting
state of indoor
temperature
sensor
reliable
connected?
Y
Replace
Adjust
temperature
sensor
N
Remove error? Remove error?
N
Replace main
board of indoor
unit
Y
finish
Adjust
connecting
state
remove the
error?
Y
N
Adjust
connecting state
Remove error?
Y
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