Toshiba MMY-MUP0721FT6P-UL Service Manual page 265

Checking Procedure to Be Followed in Event of Abnormal Shutdown
If the system is shut down due to a trouble 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 7-segment display.
Checking Procedure to be Followed in Event of Abnormal Shutdown
In the event of a system shutdown due to an abnormal state at 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 7-segment display.
* Switch settings when confirming check code: set [SW01/ SW02/ SW03] to [1/1/1].
Normal state
[A]
∗
Outdoor
unit No.
Abnormal
state
2. Confirm the check code, and perform checking following the diagnostic procedure for that check code.
3. In the event of the 7-segment display of the header unit being check code [E28.
abnormality occurring at a follower unit. Push the push-switch SW04 of the header unit for several
seconds. The outdoor fan will run only in the outdoor unit where the trouble has occurred, so open the
panel of the unit where the fan is running, and confirm the check code of the 7-segment display.
4. Perform checking following the diagnostic procedure for that check code.
* To check the check code, set the rotary switches SW01/SW02/SW03 to [1/1/1].
2
Check the check code and follow the applicable diagnostic procedure.
3
If the 7-segment display shows [E28
Push the push-switch SW04 on the header unit and hold for several seconds.
As the fan of the outdoor unit in which the trouble 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.
[B]
], there is a trouble in a follower unit.
- 265 -
], there is an