Carrier 42QZA009DS-1 Service Manual page 77

18.3.2 For the super-slim cassette with up-down panel
18.3.2.1 Communication error between indoor unit and up-down panel
F0 Displayed
F0 Displayed
F7
Communication failure between
Communication failure between
indoor unit and up-down panel
indoor unit and up-down panel
Check the wire connection
Check the wire connection
between up-down panel and
between up-down panel and
indoor unit, is it right?
indoor unit, is it right?
Yes
Replace the up-down panel
Replace the up-down panel
18.3.2.2 Up-down panel is defective
If panel can not move
If panel can not move
slightly, check the wiring
slightly, check the wiring
of louver motors
of louver motors
No
Reconnect
Reconnect
Replace the louver
Replace the louver
motors
motors
No
No
Yes
No
Correct the connection
Correct the connection
Replace the indoor main PCB
Replace the indoor main PCB
F1 Displayed
F1 Displayed
F8
Up-down panel is defective
Up-down panel is defective
Retry if panel can up and
Retry if panel can up and
No
down normally?
down normally?
If panel can move slightly, power
If panel can move slightly, power
off, then restart the unit 2 minutes
off, then restart the unit 2 minutes
later.
If the error still exists?
later.
If the error still exists?
Check the wiring of
Check the wiring of
left and right sensors
left and right sensors
The up-down panel is defective.
The up-down panel is defective.
replace it
replace it
74
No
No
No
Yes
Reconnect
Reconnect
No