Daikin VRVIII-S, Service Manual

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Troubleshooting by Indication on the remote control SiENBE34-703
162 Troubleshooting
3.35 “
LC
” Outdoor Unit: Malfunction of Transmission between
Inverter and Control PC Board
remote control
Display
LC
Applicable
Models
RXYSQ4~6P
Method of
Malfunction
Detection Check the communication state between inverter PC board and control PC board by micro-
computer.
Malfunction
Decision
Conditions When the correct communication is not conducted in certain period.
Supposed
Causes
!
Malfunction of connection between the inverter microcomputer and outdoor control
microcomputer
! Defect of outdoor unit PC board (A1P)
! External factor (Noise etc.)
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Are the
connectors of
the inverter PC board
and the control PC board
securely
connected?
Replace the inverter PC board
(A2P) or the control PC board
(A1P).
Table 1: Combination of PC boards
Connect a connecting wire, and
then restart operation.
Are there
any broken wires
in the connectors of the
inverter PC board and the
control PC board?
Repair the broken wires, and then
restart operation.
Was the inverter PC
board or the control PC
board replaced?
Are
the inverter PC
board and the control PC board
used in combination of types
listed in Table 1?
Correct the combination following
Table 1, and then restart
operation.
RXYSQ4P7Y1B
RXYSQ5P7Y1B
RXYSQ6P7Y1B EC0640-1
RXYSQ4P7Y1BH
RXYSQ5P7Y1BH
RXYSQ6P7Y1BH
EC0640-2
PC0625-1
PC0625-2
Type of inverter
PC board
Type of control
PC board
NO
NO
NO
NO
YES
YES
YES
YES
Caution