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Y
Y
N
N
Y
N
N
Y
Y
N
N
N
Y
Y
Y
Energize the
unit and start it
Indoor unit
display F1/F2
ndoor unit
display F4/F5
Check connecting state
of outdoor
temperature sensor
Reliable
connected?
Replace
temperature
sensor?
Remove error?
Replace parts
of outdoor
electric box
Check connecting
state of indoor
temperature
sensor
reliable
connected?
Adjust
connecting state
Remove error?
Remove error?
Remove error?
Replace
temperature
sensor
Replace main
board of indoor unit
Adjust connecting
stat
Finish
(2)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:
