Toshiba MM-A0280HT Service Manual page 98

Diagnostic Procedure for Check Code
Segment Display Function
Outdoor unit 7 segment display (Interface P .C. board)
A 7 segment LED to check the operation status is provided on the interface control P .C. board.
The display contents can be selected by combining the setup numbers of the rotary switches
(SW01, SW02, and SW03) on the P .C. board.
7 segment
7 segment
display B
display A
2 1 2
position position position position
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 setup 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.
Troubleshooting
1
99
CPU
SW04
SW08
SW05
SW03 SW02 SW01
D716 D717 D714 D715
7 segment 7 segment
LED (A) LED (B)
14