Daikin RXYQ72 Serivce Manual page 193

Troubleshooting by Indication on the Remote Controller
Troubleshooting
182
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Is the
outdoor units multi
connection transmission
wiring normal?
YES
Is the
indoor / outdoor unit
transmission wiring
normal?
YES
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
NO
NO
YES
NO
YES
Check
YES
and see if the following items
are normal.
External control adaptor for outdoor unit
•Is this PCB energized?
•Does the cool/heat unified address match?
Outdoor unit (unified master unit)
•Is this energized?
•Does the cool/heat unified address match?
YES
Does a
malfunction occur when
the cool / heat selector is
set to "IND?"
YES
SiUS39-601
Fix the outdoor units multi
connection transmission
wiring and reset power.
Fix the indior / 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 the external control
adaptor for outdoor unit.
Replace the outdoor unit PC
board (A1P).
(V2824)
Troubleshooting