Toshiba A90-0132, Service Manual

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Troubleshooting
Diagnostic procedure for check code
Segment display function
Outdoor unit 7 segment display (Interface PC board)
A 7 segment LED to check the operation status is provided on the interface control PC board. The display contents can be
selected by combining the set-up numbers of the rotary switches (SW01, SW02, and SW03) on the PC board.
7 segment
display A
7 segment
display B
Position
2
Position
2
Position
1
Position
1
7 segment
LED (A)
7 segment
LED (B)
Check procedure when emergency stop has occurred
When the system has stopped due to an error of the outdoor unit, check the following items.
(1) Remove lower painted panel and electrical cover on the inverter outdoor unit, and check the 7 segment display.
A check code is displayed at the right side of the 7 segment display.
[U1] [nn] (nn: Check code)
(Switch set-up when checking the check code: SW01 [1], SW02 [1], SW03 [1])
(2) Confirm the check code, and implement check operation according to the Troubleshooting guide for each check code.
(3) If [U1] [d2] is displayed on the 7 segment display, an error occurs on the fixed-speed outdoor unit. Push the push-
switch SW04 of the inverter outdoor unit for several seconds.
Only the outdoor fan in which error occurred operates. Open the panel of the unit of which the fan operated, and check
the code on the 7 segment display.
(4) Implement check operation according to the Troubleshooting guide for each check code.
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