Malfunction Of Transmission Between Inverter And Control Pcb - Daikin E-Series Service Manual

SiENBE18-621
7.22 Malfunction of Transmission between Inverter and
Control PCB
LC
Remote Control
Display
Applicable
AII outdoor unit models
Models
Method of Check the communication state between inverter PCB and control PCB by micro-computer.
Malfunction
Detection
Malfunction
When the correct communication is not conducted in certain period.
Decision
Conditions
" Malfunction of connection between the inverter microcomputer and outdoor control
Supposed
Causes
" Defect of outdoor unit PCB
" Defect of noise filter
" External factor (Noise etc.)
Troubleshooting
Troubleshooting
microcomputer
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The
microcomputer
monitor (green) on the
outdoor unit PC board
(A1P) is
blinking.
NO
The voltage
between red and
white of X1A on the inverter
unit is the power supply
voltage.
NO
YES
YES
Troubleshooting for Outdoor Unit
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.
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