In Checking The Number Of Connected Outdoor Units And Connected Indoor Units After Ad; Units That Do Not Operate In A Test Operation.) - Toshiba MMY-MAP0724HT6UL Service Manual

8-5-4. In checking the number of connected outdoor units and
connected indoor units after address setup, a lower
number of connected units is displayed. (There are
outdoor/indoor units that do not operate in a test
operation.)
Status
Miswiring of communication lines between outdoor units
The number of
or an unconnected wire ( Fig. 4). (Address setup
connected
outdoor units is
operation finished without recognizing a miswired
too few.
follower unit.)
Miswiring of communication lines between indoor units
The number of
or an unconnected wire ( Fig. 5). (Address setup
connected indoor
operation finished without recognizing a miswired indoor
units is too few.
unit.)
The indoor remote control is not connected with wire.
Miswiring of the indoor remote control
The number of
outdoor units
connected to a
Indoor remote control communication circuit error
group is too few in
If 460 V is incorrectly applied to the remote control
group operation
terminal, the remote control communication circuit fails.
from an indoor
remote control.
Cause
82
Countermeasures
After modification of wiring, set up the addresses again and
check the number of connected outdoor units.
After modification of wiring, set up the addresses again and
check the number of connected indoor units.
Using the main indoor remote control connected to a group,
start a test operation, specify the unit that is not operating (the
unit not connected to the group), and then check the wiring.
Using the main indoor remote control connected to a group,
start a test operation and then specify the unit that is not
operating (the unit not connected to the group). Remove the
fast-on terminal connected to remote control terminals A/B,
and check the voltage. If voltage is not applied (normally 15
to18 V), replace the PC board.