Lc " Indoor Unit: Malfunction Of Transmission Between Inverter And Control Pc Board - Daikin ERSQ 011AAV1 Service Manual

Troubleshooting by Indication on the Remote Controller
3.47 "LC " Indoor Unit: Malfunction of Transmission between
Inverter and Control PC Board
LC
Remote Control
Display
Subcode 29
Applicable
All indoor units
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
186
Malfunction of connection between the inverter microcomputer and indoor control
microcomputer
Defect of indoor unit PC board [A4P (1
External factor (Noise etc.)
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Caution
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
ø
) or A5P (3
NO
YES
ø
)]
Connect a connecting wire, and
then restart operation.
Repair the broken wires, and then
restart operation.
Replace the inverter PC board
[A4P (1Ø) or A5P (3Ø)] or the control
PC board
ESIE09-08
Troubleshooting