Service manual

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Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(V2831)
NO
YES
YES
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
Normal
NO
Is electricity being
introduced for the first
time after installation or
after an indoor or outdoor
unit PC board has been
replaced?
Is indoor - outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
Normal
NO
Does a malfunction occur?
NO
Does a "UH"
malfunction occur for all
indoor units in the
system?
YES
NO
Does a malfunction
occur even after 12
minutes elapses from
the time when electricity
is introducedto indoor
and outdoor units?
YES
Replace indoor unit PC board.
Replace outdoor unit PC
board (A1P).
After fixing incorrect wiring,
push and hold the RESET
button on the outdoor unit
PC board for 5 seconds
Replace whichever is
defective.
∗ The unit will not run for up to
12 minutes.