Malfunction Of Transmission Between Outdoor Units - Panasonic Urban Multi MX1R Series Service Manual

Troubleshooting
3.29

Malfunction of Transmission Between Outdoor Units

U7
Remote Controller
Display
„ Improper connection of transmission wiring between outdoor unit and BMS interface adaptor for
Supposed Causes
„ Improper cool/heat selection
„ Improper cool/heat unified address (outdoor unit, BMS interface adaptor for outdoor unit)
„ Defect of outdoor unit PC board (A1P)
„ Defect of BMS interface adaptor for outdoor unit
Troubleshooting
526
outdoor unit
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
C/H SELECT is set to "IND".
NO
Cool / heat selection is unified.
YES
C/H SELECT
is set to "MASTER."
NO
C/H SELECT
is set to "SLAVE."
NO
Is the indoor
YES
/ outdoor unit transmission
wiring normal?
YES
NO
YES
Check
YES
and see if the following items
are normal.
BMS interface adaptor for outdoor unit
•Is there continuity?
•Does the cool/heat unified address match?
Outdoor unit (unified master unit)
•Is there continuity?
•Does the cool/heat unified address match?
YES
Does
a malfunction occur when
the cool / heat selector is set
to "IND?"
YES
Troubleshooting UM Combination "MA1R Series" Using R-407C
PACD011001C2
NO
Fix the indoor/outdoor unit
transmission wiring.
Replace the outdoor unit PC
Board (A1P).
Set C/H SELECT to "IND."
The cool / heat unified address for
outdoor units in outdoor - outdoor
unit transmission is duplicated.
Set the address correctly.
NO
Fix the problem.
NO
Replace BMS interface adaptor
for outdoor unit.
Replace the outdoor unit PC
board (A1P).
(VF056)