Daikin RXYQ72 Serivce Manual page 178

SiUS39-601
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Are the
connectors
between the main
PC board (A1P),
NO
fan drive PC board (A3P)
and inverter PC board
(A2P) connected
securely?
YES
The
transmission
wiring between the
YES
outdoor unit PC board,
fan drive board and
inverter unit is
disconnected.
NO
The
microcomputer
NO
monitor (green) on
fan drive board is
blinking.
YES
The
microcomputer
YES
monitor (green) on
the inverter P.C.B
is blinking.
NO
The voltage
between 2 pins
YES
of X1A on the inverter
unit is 208 ~ 230 V.
NO
Troubleshooting by Indication on the Remote Controller
Connect transmission wiring and
turn on again.
Fix the disconnection and turn on
again.
Check connection of the connector.
Defect of outdoor main PC board
or defect of inverter PC board.
Replace inverter PC board.
When the LC malfunction occur
again, replace control PC board.
Check the noise filter (Z1F) for
disconnection, and check the
power supply wiring or the inverter
PC board.
(V2815)
167