Transmission Abnormality; Lc-14-15-16 - Transmission Abnormality Main Pcb; Lc-19-20-21 - Transmission Abnormality Main Pcb - Daikin VRV IV+ Service Manual

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Trigger Effect
When inverter PCB Unit will stop
A6P detects phase operating.
loss to compressor
on U, V, W.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check if the power supply is conform with the regulations. See
"4.1 Electrical circuit" on page 130.
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance
>10%),
▪ Power drop,
▪ Short circuit.
2 Perform a check of the inverter PCB A6P. See
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P.
3 Perform a check of
"3.2 Compressor" on page 82.
Possible cause: Faulty compressor M2C.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.88 LC-01 – Transmission abnormality
Trigger Effect
No transmission Unit will stop
between PCB boards. operating.
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
page 106.
Possible cause: Faulty main PCB or wrong capacity setting.
2 Perform a check of the noise filter PCB. See
PCB" on page 110.
Possible cause: Faulty noise filter PCB.
3 Perform a check of the inverter PCB. See
page 99.
Possible cause: Faulty inverter PCB.
4 Perform a check of the fan inverter PCB. See
PCB" on page 92.
Possible cause: Faulty fan inverter PCB.
5 Check that the bridge connector X4A of the fan inverter PCB is
correctly connected. See "3.6 Fan inverter PCB" on
Possible cause: Open jumper X4A on fan inverter PCB.
6 Check the wiring between the PCB's. See
diagram" on page 146.
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.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
Reset
Manual reset via user
interface.
"3.8 Inverter
the compressor M2C. See
Reset
Automatic reset.
"3.9 Main PCB" on
"3.10 Noise filter
"3.8 Inverter PCB" on
"3.6 Fan inverter
page 92.
"6.2 Wiring
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.89 LC-14-15-16 – Transmission abnormality
main PCB/inverter PCB A3P
Main error code Sub error code
LC 14
15
16
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 Effect
No transmission Unit will stop
between main PCB operating.
and inverter PCB
A3P.
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
page 106.
Possible cause: Faulty main PCB or wrong capacity setting.
2 Perform a check of the noise filter PCB A2P. See
filter PCB" on page 110.
Possible cause: Faulty noise filter PCB A2P.
3 Perform a check of the inverter PCB A3P. See
PCB" on page 99.
Possible cause: Faulty inverter PCB A3P.
4 Check the wiring between the PCB's. See
diagram" on page 146.
Possible cause: Faulty wiring between PCB's.
5 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.
2.3.90 LC-19-20-21 – Transmission abnormality
main PCB/fan inverter PCB A4P
Main error code Sub error code
LC 19
20
21
2 Troubleshooting
Unit
Main
Sub 1
Sub 2
Reset
Automatic reset.
"3.9 Main PCB" on
"3.10 Noise
"3.8 Inverter
"6.2 Wiring
Unit
Main
Sub 1
Sub 2
Service manual
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