Daikin VRV IV+ Service Manual page 128

2 | Troubleshooting
2.3.115 LC-24-25-26 – Transmission abnormality main PCB/fan inverter PCB A7P
Service manual
128
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
No transmission between
main PCB and fan inverter
PCB A4P.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Perform a check of the main PCB. See
Possible cause: Faulty main PCB or wrong capacity setting.
2 Perform a check of the noise filter PCB A2P. See
4
PCB" [ 298].
Possible cause: Faulty noise filter PCB A2P.
3 Perform a check of the inverter PCB A3P. See
Possible cause: Faulty inverter PCB A3P.
4 Perform a check of the fan inverter PCB A4P. See
4
PCB" [ 259].
Possible cause: Faulty fan inverter PCB A4P.
5 Check that the bridge connector X4A of the fan inverter PCB is correctly
connected. See "3.8 Fan inverter
Possible cause: Open jumper X4A on fan inverter PCB.
6 Check the wiring between the PCB's. See
Possible cause: Faulty wiring between PCB's.
7 Check if the correct spare part is installed for all PCB's. See checking
procedures of the specific PCB's.
Possible cause: Wrong spare part PCB installed.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
LC
Effect
Unit will stop operating.
"3.11 Main
"3.10 Inverter
4
PCB" [ 259].
"6.2 Wiring
Sub error code
24
25
26
Reset
Automatic reset.
4
PCB" [ 290].
"3.12 Noise filter
4
PCB" [ 274].
"3.8 Fan inverter
4
diagram" [ 385].
Unit
Main
Sub 1
Sub 2
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05