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8-3. Check at main power-on
After turning on the main power of the indoor units and outdoor unit in the refrigerant line to conduct a test
operation, check the following items in each outdoor and indoor unit.
(After turning on the main power, be sure to check in order: indoor unit outdoor unit.)
<Check on the outdoor unit>
(1) Check that all the rotary switches, SW01, SW02, and SW03, on the interface P.C. board of the outdoor unit are
set to “1.”
(2) If another check code is displayed on the 7-segment display [B], remove the cause of the problem referring to
Section, “9 Troubleshooting”.
(3) Check that “L08” is displayed on the 7-segment display [B] on the interface P.C. board of the outdoor unit. (L08:
Indoor address not set up)
(If the address setup operation has already been completed during servicing, etc., the above check code is not
displayed, and only “U1” is displayed on the 7-segment display [A].)
<Check on the indoor unit>
(1) Display check on the remote controller (in the case of a wired remote controller)
Check that a frame, as shown in the following figure at left, is displayed on the LC display section of the remote
controller.
If no frame is displayed, as shown in the above figure at right, the remote controller does not have a normal
supply of power; check the following items.
• Check the power supply of the indoor unit.
• Check the cabling between the indoor unit and the remote controller.
• Check whether there is a cutoff of wire around the indoor control P.C. board or not, and check for connection
failures of the connectors.
• Check for failure of the transformer for the indoor electrical control box.
• Check for failure of the indoor control P.C. board.
Normal status
(power supplied and operation stopped)
When power is not supplied normally
d
o
o
g
o
N
d
o
o
G
SW09
SW07
SW11
SW06
SW10
SW12 SW13
SW16
SW14
SW17
D600 D601 D602 D603 D604
SW04
SW05
SW15
SW01
SW02
SW03
SW30
D600 D601 D602 D603 D604
SW04
SW05
SW15
SW01
SW02
SW03
Interface P.C. board
Push switch
7-segment
display [A]
Push switch
7-segment
display [B]
Rotary switches
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