Mitsubishi Electric PUHY-200YMF-B Service Handbook page 153

Checking
Meaning, detecting method
code
7102 Connected unit count over
7105 Address setting error
• Erroneous setting of OC unit
address
• Erroneous setting of BC con-
troller address
Trouble source :
Outdoor unit
BC controller
7107 Connection No. setting error
Can not operate because connec-
tion No. of indoor unit wrongly set.
Trouble source :
BC controller
7111 Remote control sensor error
Error not providing the tempera-
ture designed to remote control-
ler sensor.
Trouble source :
Indoor unit
7130 Different Indoor model and BC
controller connected error
Cause
2) The Outdoor unit address is being
set to 51~100 under automatic ad-
dress mode (Remote controller dis-
plays "HO").
3) Slipping off of transmission wiring
at Outdoor unit.
4) Short circuit of transmission line in
case of 3) & 4), remote controller
displays "HO".
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 is exceeded as follows:
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 connection No. has not
been set when used at joint.
1) In case when the old type remote
controller for M-NET is used and the
remote controller sensor is de-
signed on indoor unit. (SW1-1
turned ON)
A indoor unit not for the R407C (model:
P•••) is connected.
–151–
Checking method & Countermeasure
a) Check for the model total (capacity code total)
of indoor units connected.
Check that the address of OC unit is being 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 connection No. A?
2 Check total capacity of indoor units which
are set for the same connections No. Judged as
trouble when it applies to Cause 1).
3 Check whether the smallest connection No.
is set when used at joint.
b) Check whether indoor unit capacity code (SW2)
is wrongly set. (Keep factory shipment condition.)
For erroneous switch setting, modify it, turn off
the power source of outdoor unit, and indoor unit
simultaneously for 5 minutes or more, and then
turn on.
a) Replace the old remote controller by the new
remote controller.
Use the P••• indoor unit.