Toshiba MMY-MUP0961HT6P-UL Service Manual page 255

(6) Turn on the power supply to all the units connected to the system other than the failed follower unit.
Determine what to do with the power supply to the failed follower unit in the following manner.
<In case of failure in compressor, electrical part, P.C. board>
Leave the power supply off.
<In case of failure in refrigerating circuit or related part (pressure sensor, temperature sensor, refrigerating
cycle part, or fan system part)>
Turn on the power supply to protect the compressor (by turning on the case heater).
(When the power supply to the unit is turned on, [E19] (failure in the number of outdoor header units) will be
displayed on the 7-segment display. However, this will not cause any problems.)
(7) Perform settings needed to gain permission for backup operation from the header unit (failure clearance).
1) Set SW01/02/03 on the interface P.C. board to 1/1/1 and confirm that [U1] [E26] (dropping out of an
outdoor unit) is displayed on the 7-segment display.
2) Set SW01/02/03 on the interface P.C. board to 2/16/1. Upon confirming that [Er] [... ... ...] is displayed on
the 7-segment display, push SW04 and hold for 5 seconds or more.
3) [Er] [... CL] (failure clearance completed) will be displayed on the 7-segment display.
4) Set SW01/02/03 back to 1/1/1. (The display should change to [U1] [– – –].)
(7)
Set SW01/02/03 to 1/1/1
[U1] [E26] will be displayed.
Set SW01/02/03 to [2/16/1].
[Er] [... ... ...] will be displayed.
Push SW04 and hold for 5 seconds or more
[Er] [... CL] will be displayed.
Set SW01/02/03 back to 1/1/1.
[U1] [– – –] will be displayed.
This is the end of follower outdoor unit backup operation setting. Check the operation.
Interface P.C. board of header unit
Push switch
SW04
7-segment
display [A]
SW01
Rotary switches
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SW05 SW06
7-segment
display [B]
SW02 SW03