Toshiba MMY-MAP1006FT8(J)P-E Service Manual page 244

(11)Turn on the power supply to all the units connected to the system other than the failed unit.
Determine what to do with the power supply to the failed unit in the following manner.
<In case of fault in compressor, electrical part, I/F P.C. board, or IPDU P.C. board>
Leave the power supply off.
<In case of fault 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] (trouble in the number of outdoor header units) will be
displayed on the 7-segment display. However, this will not cause any problems.)
This is the end of header outdoor unit backup operation setting. Check the operation.
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