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4-3-1 (1) Check at main power-ON
After turning on the main power of the indoor units and outdoor unit in the refrigerant system to be
executed with 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 of indoor unit → outdoor unit.)
<Check on outdoor unit>
1. Check that all the rotary switches, SW01, SW02, and SW03 on the interface P.C. board of the header
outdoor unit are set up to "1".
2. If other error code is displayed on 7-segment [B], remove the cause of trouble.
3. Check that [L08] is displayed on 7-segment display [B] on the interface P.C. board of the header
outdoor unit. (L08: Indoor address unset up)
(If the address setup operation has already finished in service time, etc, the above check code is not
displayed, and only [U1] is displayed on 7-segment display [A].)
Interface P.C. board
<Check on indoor unit>
1. Display check on remote controller (In case of wired remote controller)
Check that a frame as shown in the following left figure is displayed on LC display section of the remote
controller.
(Power and operation stop)
If a frame is not displayed as shown in the above right figure, the power of the remote controller is not
normally turned on. Therefore check the following items.
• Check power supply of indoor unit.
• Check wiring between indoor unit and remote controller.
• Check whether there is cutoff of cable around the indoor control P.C. board or not, and check
connection failure of connectors.
• Check failure of transformer for the indoor microcomputer.
• Check indoor control P.C. board failure.
7-segment display [A]
UNIT
SET
CL
Normal status
7-segment display [B]
SW01
SW02
SW03
SET
CL
Abnormal status
(Power is not normally turned on.)
63
UNIT
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