Daikin VRV IV+ Service Manual page 126

2 | Troubleshooting
2.3.112 LC-01 – Transmission abnormality
Service manual
126
1 Check if the power supply is conform with the regulations. See
4
circuit" [ 356].
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
Possible cause: Faulty inverter PCB A6P.
3 Perform a check of the compressor M2C. See "3.3 Compressor" [
Possible cause: Faulty compressor M2C.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
No transmission between
PCB boards.
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. See
Possible cause: Faulty noise filter PCB.
3 Perform a check of the inverter PCB. See
Possible cause: Faulty inverter PCB.
4 Perform a check of the fan inverter PCB. See
Possible cause: Faulty fan inverter PCB.
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.
"3.10 Inverter
Effect
Unit will stop operating.
"3.11 Main
"3.12 Noise filter
"3.10 Inverter
"3.8 Fan inverter
4
PCB" [ 259].
"6.2 Wiring
"4.1 Electrical
4
PCB" [ 274].
4 221].
Reset
Automatic reset.
4
PCB" [ 290].
4
PCB" [ 298].
4
PCB" [ 274].
4
PCB" [ 259].
4
diagram" [ 385].
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05