Daikin VRV IV+ Service Manual page 106

2 | Troubleshooting
2.3.90 L1-20-25-45 – Power transistor error on inverter PCB A6P
2.3.91 L1-21-26-46 – Inverter PCB A6P hardware fault
Service manual
106
Main error code
L1
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
Main PCB detects voltage/
current errors on output
waveform or current
read-out.
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 inverter PCB A6P. See
Possible cause: Faulty inverter PCB A6P or non‑compatible inverter PCB.
3 Perform a check of the compressor. See "3.3 Compressor" [
Possible cause: Faulty compressor.
4 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.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Main error code
L1
Sub error code
20
25
45
Effect
Unit will stop operating.
"3.11 Main
"3.10 Inverter
Sub error code
21
26
46
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
Power reset at outdoor
unit.
4
PCB" [ 290].
4
PCB" [ 274].
4
221].
"4.1 Electrical
Unit
Main
Sub 1
Sub 2
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05