3.35 " Lc " Outdoor Unit; Inverter And Control Pc Board - Daikin RXMQ4·5·6PVE Service Manual

Troubleshooting by Indication on the Remote Controller

3.35 " LC " Outdoor Unit:

Inverter and Control PC Board

LC
Remote
Controller
Display
Applicable RX(Y)MQ4~6P
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
Causes
Troubleshooting
170
Malfunction of Transmission between
Malfunction of connection between the inverter microcomputer and outdoor control
microcomputer
Defect of outdoor unit PC board
Defect of noise filter
External factor (Noise etc.)
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
Si34-603
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.
Troubleshooting