Daikin VRV Aurora RXLQ-TATJU Series Service Manual page 264

Troubleshooting by Error Code
257
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Diagnosis Flowchart-2
AH-04
Dust detection sensor error
Is the
connector X12A on the
self-cleaning decoration panel PCB
properly connected?
YES
Are the
connectors X18A and X19A
on the infrared sensor PCB
properly connected?
YES
Is the harness
short-circuited?
NO
Is there any
external factor other than the
error such as noise?
NO
Turn OFF the power supply and
then turn it ON again. Then, start
operation with remote controller.
Error AH recurs,
or the self-cleaning decoration panel
lamp (red) blinks?
YES
NO
NO
YES
YES
NO
SiUS341802EC
Properly connect the
connector.
Properly connect the
connector(s).
Replace the harness.
Remove the external factor.
Normal.
The error could be caused by
other causes. Refer to other
diagnosis flowcharts in the
following order:
AH-05→03→06→07→08→09.
Check the indoor unit control
PCB and self-cleaning
decoration panel PCB.
Part 6 Service Diagnosis