–126–
Checking
code
7102
7105
7107
7111
7130
Meaning, detecting method Cause Checking method & Countermeasure
Connected unit count over
Address setting error
• Erroneous setting of OC unit
address
• Erroneous setting of BC con-
troller address
Trouble source :
Outdoor unit
BC controller
Branch No. setting error
Can not operate because branch
No. of indoor unit wrongly set.
Trouble source :
BC controller
Remote control sensor error
Error not providing the tempera-
ture designed to remote control-
ler sensor.
Trouble source :
Indoor unit
Different Indoor model and BC
controller connection error
2) The Outdoor unit address is set to
51~100 under automatic address
mode (Remote controller displays
“HO”).
3) Disconnection of transmission wir-
ing at Outdoor unit.
4) Short circuit of transmission line in
case of 3) & 4), remote controller
displays “HO”.
5) Disconnection of transmission wir-
ing at BC controller.
6) BC controller not for the BIG R2
(model: FA, FB type) is connected.
1) Setting error of Outdoor unit ad-
dress.
The address of Outdoor unit is not
being set to 51~100.
2) The address of BC controller is not
being set within 51~100.
1) Indoor unit capacity per connector
joint exceeds the following limitis:
Single connection :
81 or more
Two connection joint :
161 or more
Three connection joint :
241 or more
Four connection joint :
321 or more
2) Four or more indoor units are set
for the same connection.
3) The smallest branch No. has not
been set when used at joint.
4) Does the address of BC controller
(slave) become the least address +
50 of Indoor controller connecting
to BC controller (slave)?
5) The address of Indoor Unit, which
is connected to BC controller
(slave), sets up the small address
from the greatest address of Indoor
Unit which is connected to BC con-
trol (master).
1) The old type remote controller for
M-NET is used and the remote con-
troller sensor is designed for the in-
door unit. (SW1-1 turned ON)
An indoor unit not intended for use with
R407C (model: P•••) is connected.
d) Check for the model total (capacity code total)
of indoor units connected.
Check that the address of OC unit is set to 51~100.
Reset the address if it stays out of the range, while
shutting the power source off.
When BC controller is out of the range, reset it while
shutting the power source of both OC unit and BC
controller off.
a) Check indoor unit connection No. in refrigerant
circuit.
1 No four or more indoor units which are set
for the same branch No. A?
2 Check total capacity of indoor units which
are set for the same branch No. Judged as
trouble when it applies to Cause 1).
3 Check whether the smallest branch No. is
set when used at joint.
b) Check whether indoor unit capacity code (SW2)
is wrongly set. (Keep the factory setting.)
For erroneous switch setting, if any, turn off the
power source of outdoor unit and indoor unit si-
multaneously for 5 minutes or more, and then
turn them back on.
C) Verify the address of BC controller (slave) and
Indoor Unit.
a) Replace the old remote controller with a new re-
mote controller.
Use the P••• indoor unit.
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