ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 199
3.48 “LC ” Indoor Unit: Malfunction of Transmission between
Inverter and Control PC Board
Remote Control
Display
LC
Subcode 29
Applicable Models All indoor units
Method of
Malfunction
Detection
Check the communication state between inverter PC board and control PC board by micro-computer.
Malfunction
Decision Conditions
When the correct communication is not conducted in certain period.
Supposed Causes Malfunction of connection between the inverter microcomputer and indoor control microcomputer
Defect of indoor unit PC board [A4P (1ø) or A5P (3ø)]
External factor (Noise etc.)
Troubleshooting
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
Are the
connectors of the
inverter PC board and the
control PC board securely
connected?
Replace the inverter PC board
[A4P (1Ø) or A5P (3Ø)] or the control
PC board
Connect a connecting wire, and
then restart operation.
NO
Are there
any broken wires in
the connectors of the
inverter PC board and
the control PC
board?
Repair the broken wires, and then
restart operation.
YES
YES
NO
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