Lc" Indoor Unit: Malfunction Of Transmission Between Inverter And Control Pc Board - Daikin ALTHERMA HT Service Manual

ESIE09-08B
3.48 "LC" Indoor Unit: Malfunction of Transmission between
Inverter and Control PC Board
LC
Remote Control
Display
Subcode 29
All indoor units
Applicable
Models
Check the communication state between inverter PC board and control PC board by micro-
Method of
computer.
Malfunction
Detection
When the correct communication is not conducted in certain period.
Malfunction
Decision
Conditions
 Malfunction of connection between the inverter microcomputer and indoor control
Supposed
Causes
 Defect of indoor unit PC board [A4P (1
 External factor (Noise etc.)
Troubleshooting
Troubleshooting
microcomputer
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
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
Troubleshooting by Indication on the Remote Controller
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
189