Carrier 38QUS012D8S Service Manual page 119

2.4.2 Super-Slim Cassettes with an Up-Down Panel
2.4.2.1 Communication Errors between Indoor Unit and Up-Down Panel
F7 F0 Displayed
F0 Displayed
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 in working
indoor unit, is it in working
order?
order?
Yes
Replace the up-down panel.
Replace the up-down panel.
Has the problem been solved?
Has the problem been solved?
2.4.2.2 Up-down panel is defective
If panel can not move,
If panel can not move,
check the wiring of the
check the wiring of the
louver motors. Are they
louver motors. Are they
wired incorrectly?
wired incorrectly?
No
Reconnect
Reconnect
Replace the louver
Replace the louver
motors
motors
Electrical Control System
No
No
Yes
No
Correct the connection
Correct the connection
Replace the indoor main PCB
Replace the indoor main PCB
F8
F1 Displayed
F1 Displayed
Up-down panel is defective
Up-down panel is defective
Retry. Can the panel move
Retry. Can the panel move
No
up and down normally?
up and down normally?
If panel can move, power off, then
If panel can move, power off, then
restart the unit 2 minutes later.
restart the unit 2 minutes later.
Has the problem been solved
Has the problem been solved
Check the wiring of
Check the wiring of
left and right
left and right
sensors. Are they
sensors. Are they
correctly wired?
correctly wired?
The main control PCB of up-down
The main control PCB of up-down
panel is defective. Replace it
panel is defective. Replace it
Yes
?
?
No
No
Yes
Troubleshooting
Reconnect
Reconnect
No
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