Service manual

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(V2824)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
Replace the outdoor unit PC
Board (A1P).
YES
C/H SELECT is set to "IND".
Cool / heat selection is
unified.
C/H SELECT is set
to "MASTER."
NO
C/H SELECT is
set to "SLAVE."
YES
NO
Check and see if the
following items are
normal.
NO
Does a malfunction
occur when the cool /
heat selector is set to
"IND?"
YES
Set C/H SELECT to "IND."
YES
Fix the outdoor units multi
connection transmission
wiring and reset power.
NO
Is the outdoor units multi
connection transmission
wiring normal?
Is the indoor / outdoor
unit transmission
wiring normal?
NO
YES
Fix the indior / outdoor unit
transmission wiring.
The cool / heat unified
address for outdoor units in
outdoor - outdoor unit
transmission is duplicated.
Set the address correctly.
YES
NO
NO
YES
YES
Replace the outdoor unit
outside control adapter.
replacement
Replace the outdoor unit PC
board (A1P).
Outdoor unit outside control adapter
?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?
Fix the problem.