Daikin BRR9B1V1, Installation Manual

Page: 32 / 40

10 | Troubleshooting
Installation manual
32
BRR9B1V1
Communication box
4P617761-1 – 2020.04
What to check? How to check? Solution
Baud rate setting Baud rate setting on the monitoring system
against the baud rate setting on the
communication box. Set the baud rate setting correctly.
See
"8.4.2 To configure the
communication box PCB for the
outdoor unit and capacity up
unit"
[
4
26].
DIII weak current
transmission wiring Data of each address on the monitoring system. Check the wiring of the unit with
data that cannot be checked and
correct the wiring.
H2P is ON and H7P is flashing on the
communication box. Follow the instructions in
"
10‒1 Operation procedure step 1" [
4
32] to
diagnose the communication box.
Communication cannot be
established with any of the outdoor
units. Check the transmission wiring
(DIII weak current) and address
settings.
RS‑485 weak current
transmission wiring Make sure that the field settings are made
correctly, check whether the data can be checked
on the monitoring system. Check RS‑485 weak current
transmission wiring and correct it
(e.g. disconnection, incorrect
polarity).
Refrigerator connection
other than an outdoor
unit and capacity up
unit H2P is ON on the communication box. Follow the
instructions in
" 10‒2 Operation procedure
step 2" [
4
33] to diagnose the communication
box.
Disconnect the non-CO₂ refrigerator.
PCB error H2P is ON on the communication box. Follow the
instructions in
" 10‒1 Operation procedure
step 1" [
4
32] to diagnose the communication
box.
Replace PCB (A2P).
No LED is ON on PCB (A2P).
Check conditions of all units (indoor unit, outdoor
unit and capacity up unit).
10‒1 Operation procedure step 1
Procedure LED indication
(a)
Remarks
H1P H2P H3P H4P H5P H6P H7P
Initial indication
(b)
H6P flashing: RS‑485
communication error
H7P flashing: DIII communication
error (if communication is not
established with any of the
indoor units).
Press BS1 once. —
Press BS2 twice.