Toshiba MMU-P0121H Service Manual page 73

Check code
[8E]
Outdoor unit connection
over limit
Is No.of connected
outdoor units below 5 units?
YES
Is communication
cable normally connected
between outdoor units?
YES
Check interface P.C. board.
Check code
Duplicated terminal outdoor addresses
Is SW09 bit 1 of master
outdoor interface
P.C. board off? (*1)
YES
Reset the power supply
and execute automatic address.
YES
Id [8F] detected?
YES
Check interface P.C. board.
( * 1) SW09 bit 1 on interface P.C. board of the master outdoor unit at exchanges set up method of outdoor
address.
Usually, the set up of outdoor address setting is automatic addressing (SW : OFF). If an incorrect set
up is performed, the compressor may be damaged.
1. No. of connected outdoor units over limit
2. Connection error of communication cable between outdoor units
NO
NO
[8F]
NO
NO
Operation cause
No.of connectable outdoor units for
1 system is Max. 5 units.
Modify connection of communication cable.
Operation cause
1. Address set up of outdoor unit was duplicated.
2. Interface P.C. board error
Turn off SW09 bit 1 on interface P.C. board
of master outdoor unit.
3-70
It is normal.
Restart the operation.