Daikin REYQ72 Serveice Manual page 204

SiUS39-602
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is
electricity
being introduce for
the first time after YES
installation or after an indoor
or outdoor unit PC
board has been
replaced?
NO
Is
indoor - outdoor and
outdoor - outdoor unit
transmission wiring
normal?
YES
Push and hold the RESET
button on the outdoor unit
PC board for 5 seconds
Does a malfunction occur?
YES
Does
a "UH" malfunction occur
for all indoor units in
the system?
YES
Troubleshooting by Indication on the Remote Controller
Does
a malfunction
occur even after 12
minutes elapses from the
time when electricity is
introduced to indoor
and outdoor
units?
YES
NO
NO
NO
NO
Normal
After fixing incorrect wiring,
push and hold the RESET
button on the master outdoor
unit PC board for 5 seconds.
∗ The unit will not run for up to
12 minutes.
Normal
Replace indoor unit PC board.
Replace outdoor unit PC
board (A1P).
(V2831)
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