Lc" Outdoor Unit: Malfunction Of Transmission Between Inverter And Control Pc Board - Daikin VRVIII-S Service Manual

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