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8-6. 7-Segment Display Function
7-segment display on outdoor unit (interface P.C. board)
The interface control P.C. board features a 7-segment LED display designed to check operational status. Display
items can be changed by changing the combination of the number settings of rotary switches provided on the P.C.
board (SW01, SW02 and SW03).
Interface P.C. board
Checking Procedure to Be Followed in Event of Abnormal Shutdown
If the system is shut down due to an error in the outdoor unit, perform checks in the following steps:
1
Open the panel of the outdoor unit and inspection window of the electric parts box, and check the
7-segment display.
The check code is displayed in the right-hand section of the 7-segment display [B].
[U1] [OOO] ([OOO]: Check code)
* To check the check code, set the rotary switches SW01/SW02/SW03 to [1/1/1].
If there is a sub-code, the display alternates between the check code [OOO] (3 seconds) and the sub-code
[OOO] (1 second).
2
Check the check code and follow the applicable diagnostic procedure.
3
If the 7-segment display shows [U1] [E28], there is an error in a follower unit.
Press the push-switch SW04 on the header unit and hold for several seconds.
As the fan of the outdoor unit in which the error has occurred comes on, open the panel of the unit, and check
the check code shown on the 7-segment display.
4
Perform checks in accordance with the diagnostic procedure applicable to the check code.
Push switch
D600 D601 D602 D603 D604
7-segment display
[A]
SW01
– 219 –
SW04
SW05
SW15
7-segment display
SW02
SW03
Rotary switches
[B]
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Troubleshooting
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