Daikin RZQ100B8V3B Service Manual page 192

Error Codes: Indoor Units
1
Troubleshooting
3 3
4
5
Remark
Caution
3–44
Begin
Is the
unit a cassette
No
or built-in
type?
Yes
Is a
drain pump
connected to the
No
indoor unit
PCB?
Yes
Does the
drain pump work
after restarting
operation?
Yes
Is the
drain water level
No
abnormally
high?
Yes
There is a Remove the float switch from
malfunction of the X15A, short-circuit X15A, and
drain system.
If "A3" is detected by a PC board which is not mounted with X15A, the PC board is defective.
Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Is the
optional drain
No
raising mechanism
connected?
Yes
Check the continuity of the
short-circuit connector.
Connect
the drain
pump.
No
Is
the float
Connect
switch connected
No
float
to X15A?
switch
Yes
restart operation.
Does
"A3" appear on
the remote controller
display?
Yes
Replace indoor
unit PCB.
Is
the short
Connect the
circuit connector
No
Short-circuit
connected to X15A on
connector.
the indoor unit
PCB?
Yes
Yes
Connect the
Is there
No
Short-circuit
continuity?
connector.
Yes
Replace the
indoor unit PCB.
Set to
"emergency"
and check the
voltage of
X25A.
220-240
No
VAC?
Yes
Replace the
drain pump.
Replace float
No
switch.
Part 3 – Troubleshooting
ESIE05-03
Replace
indoor unit
PCB.