Toshiba SMMS-u MMY-MUP0801HT8 Quick Reference page 81

(2) Clearing check code by using switches on the interface board of the header unit
Using the switches on the interface P.C. board of the header unit, this function is to clear the currently detected
check code for each refrigerant circuit system without resetting the power supply.
Check codes in both outdoor and indoor units are once cleared, and check code detection is performed again.
[1]
[2]
[3]
Interface P.C. board
(3) Clearing check code by resetting power
This function is provided to clear check code in a system by resetting the power of all the outdoor and the
indoor units. As same as the clearing method by the interface P.C. board, check codes of both the outdoor and
the indoor units are once cleared, and check code detection is performed again.
<Method>
(1) Be sure to reset power of both the outdoor and the indoor units.
(2) Turn on the power of the indoor unit prior to the power of the outdoor unit.
(If the power is turned on in reverse order, a check code [E19] (No. of header unit trouble) is output.)
NOTE) After power reset, it requires usually 3 minutes to power-on due to the initial communication of the
system. In some cases, it requires max. 10 minutes.
Set the rotary switches on the interface P.C. board of
the header unit as follows.
Set SW01/SW02/SW03 to [2/16/1]
Press the push-switch SW04 on the same board for
5 seconds or more.
[ C L] is displayed in 7-segment display [B] on the
board (for 5 seconds), and check code is completely
cleared.
Push switch
SW04
7-segment
display [A]
SW01
Rotary switches
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7-segment display
[A] [B]
[ E r ] [ ]
7-segment display
[A] [B]
[ E r ] [ C L ]
SW05 SW06
SW02 SW03
7-segment
display [B]