Outdoor / Indoor Units That Do Not Operate In A Test Operation.) - Toshiba MCY-MHP0305HT-C 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 indoor units
The number of
connected indoor or an unconnected wire. (Address setup operation
units is too few.
finished without recognizing a miswired indoor unit.)
The indoor remote controller is not connected with wire.
Miswiring of the indoor remote controller
The number of
outdoor units
connected to a
Indoor remote controller communication circuit error
group is too few in
If 220 V is incorrectly applied to the remote controller
group operation
terminal, the remote controller communication circuit
from an indoor
fails.
remote controller.
Cause
After modification of wiring, set up the addresses again and
check the number of connected indoor units.
Using the main indoor remote controller 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 controller 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 controller terminals A / B,
and check the voltage. If voltage is not applied (normally 15
to18 V), replace the P.C. board.
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Countermeasures