Daikin BRR9B1V1, Installation Manual

Page: 33 / 40

10 | Troubleshooting
Installation manual
33
BRR9B1V1
Communication box
4P617761-1 – 2020.04
Procedure LED indication
(a)
Remarks
H1P H2P H3P H4P H5P H6P H7P
Press BS3 once
(error check).
(c)
DIII side
communication
error Communication error of all
outdoor units.
(d)
RS‑485
communication
error Communication error on the
RS‑485 side. An error is detected
even when the polarity is correct.
Check the address settings and
the RS‑485 wiring.
(d)
Board error Error of the PCB (A2P) of the
communication box. Replace the
PCB.
Duplicate
outdoor unit
addresses Duplicate outdoor unit addresses.
Check the address settings and
DIII wiring.
Outdoor unit
address not set The address of an outdoor unit is
not set. Check the address setting
and DIII wiring.
Slave address
setting error Slave address setting error. Check
the slave address setting and
wiring.
Press BS1 once. In normal conditions, H2P is OFF,
and H6P and H7P are ON.
(a)
= OFF, = ON, and = flashing.
(b)
The initial indication in the table shows the indication when an error is detected. If there are no communication errors, the H2P
LED is OFF and the H6P and H7P LEDs are ON.
(c)
When multiple errors are detected, multiple LEDs (H2P to H7P) are flashing.
(d)
For both DIII side and RS‑485 side, if a communication error occurs after the communication is confirmed, an error is generated. If
the communication has not been confirmed, errors are not detected.
10‒2 Operation procedure step 2
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 3 times.
Press BS3 once
(error check). Reserve
Reserve
Different
refrigerator A non-CO₂ refrigerator is
connected.
Press BS1 once. In normal conditions, H2P turns
OFF, and H6P and H7P turn ON.