Communication Sending Error Between Outdoor Units - Toshiba Super MMU-AP0091H Service Manual

Super modular multi
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Check code
[E23] / [15]
(d07 / AI-NET)
Is there no miscabling or
disconnection on communication line
between outdoor units?
NO
Is connection of CN03 connector
on outdoor I/F P.C. board normal?
YES
Is not main power of
outdoor unit turned off?
NO
Is the end terminal resistance
between outdoor units turned on?
(SW30 Bit 1)
YES
Did power failure occur?
NO
Is there no noise source, etc?
NO
Check outdoor I/F P.C. board.
Defect
Replace
Check code name
Communication sending error
between outdoor units
YES
NO
YES
NO
YES
YES
160
Cause of operation
1. Inter-unit cable connection error between
outdoor units
2. Communication connector connection error
between outdoor units, I/F P.C. board error
3. End terminal resistance setup error between
outdoor units
Correct communication line.
Correct cabling of cable connector.
Turn on main power of outdoor unit.
Turn the end terminal resistance to ON.
Clear check code.
Check and eliminate noise, etc

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