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Energize and turn on
the unit
Indoor unit display
F1-F2 ?
Check the connection
status of indoor tem-
perature sensor
Indoor unit displays
F3/F4/F5
whether it's
connected tightly?
Check the connection
status of outdoor
temperature sensor
Adjust the conn e ction
status
Whether it's
connected tightly?
Replace temperature
sensor
Is malfunction
eliminated?
Adjust the connection
status
Is malfunction
eliminated?
Is malfunction
eliminated?
Replace main board
of indoor unit
Replace temperature
sensor
Is malfunction
eliminated?
Replace main board
of outdoor unit
Energize and turn on
the unit
yes
yes
yes
yes
no
no
no
no
no
no
no
9.3.1 Failure for te mperature sensor
Mai n te s t poin t:
● If the out door environm ent tem perature i s in normal ra nge
● If fan motor normally ru ns.
● If the radiating environ men t of indoor an d out do or unit is good
Che c k th e flo w pr o c e s s o f failur e i s :
