Toshiba MMK-AP0072H Service Manual page 66

Check code
[E23] / [15]
(Current code / 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
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 cabling of cable connector.
Turn on main power of outdoor unit.
Turn the end terminal resistance to ON.
66
FILE NO. SVM-05052
Cause of operation
Correct communication line.
Clear check code.
Check and eliminate noise, etc