Daikin Super Multi Plus E-Series - Malfunction of Transmission between Inverter and Control PCB

SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 383
7.22 Malfunction of Transmission between Inverter and
Control PCB
Remote Control
Display
LC
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Check the communication state between inverter PCB and control PCB 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 PCB
 Defect of noise filter
 External factor (Noise etc.)
Troubleshooting
Caution
NO
YES
NO
YES
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The
microcomputer
monitor (green) on the
outdoor unit PC board
(A1P) is
blinking.
The voltage
between red and white
of X1A on the inverter
unit is the power supply
voltage.
Replace outdoor unit PC
board (A1P).
Replace outdoor unit PC
board (A1P).
When the LC malfunction
occur again, replace control
PC board.
Check the noise filter (A3P)
for disconnection, and
check the power supply
wiring.