Pc Board198; Board199 - Daikin ALTHERMA HT ERSQ 011 AA Service Manual

ESIE09-08A
3.48 "LC " Indoor Unit: Malfunction of Transmission between
Inverter and Control PC Board
LC
Remote Control
Display
Subcode 29
Applicable Models All indoor units
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
 Malfunction of connection between the inverter microcomputer and indoor control microcomputer
Supposed Causes
 Defect of indoor unit PC board [A4P (1
 External factor (Noise etc.)
Troubleshooting
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Caution
Are the
connectors of the
NO
inverter PC board and the
control PC board securely
connected?
YES
Are there
any broken wires in
YES
the connectors of the
inverter PC board and
the control PC
board?
NO
Troubleshooting by Indication on the Remote Controller
ø ø
) or A5P (3 )]
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
199