Daikin VRV RXYQ72-384XAYCA 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-3
AH-05
Dust collection sign error
Is the inside of
dust collection port clogged
by dust?
NO
Is the inside of
brush unit clogged by
dust?
NO
Is the inside of
S-shaped pipe clogged by
dust?
NO
Dust accumulated in
the dust box?
NO
Is the infrared
emitter or receiver
dirty?
NO
Are the
connectors X18A and X19A
on the infrared sensor PCB
properly connected?
YES
Is the harness broken?
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
YES
YES
YES
YES
YES
NO
YES
YES
NO
SiUS342004EB
Clean the dust from the inside
of dust collection port.
Clean the dust from the inside
of brush unit.
Clean the dust from the inside
of S-shaped pipe.
Clean the dust from the dust
box. (This is not an error.)
Clean the dirty infrared emitter
and receiver.
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-03→04→06→07→08→09.
Check the indoor unit control
PCB and self-cleaning
decoration panel PCB.
Part 6 Service Diagnosis