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

PACD011001C2
3.30

Malfunction of Transmission between Outdoor Units

U7 U7 U7 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 (option)
Troubleshooting
Troubleshooting Urban Multi "MX1, ME1 Series" Using R-22
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
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)
185