L1-20-25-45 - Power Transistor Error On Inverter Pcb A6P; L1-21-26-46 - Inverter Pcb A6P Hardware Fault; L1-28-32-34 - Fan Inverter Pcb A4P Eeprom Error - Daikin VRV IV+ Service Manual

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Possible cause: Faulty inverter PCB A6P or non‑compatible
inverter PCB.
3 Perform a check of the compressor. See
page 82.
Possible cause: Faulty compressor.
4 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.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.66 L1-20-25-45 – Power transistor error on
inverter PCB A6P
Main error code Sub error code
L1 20
25
45
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
Main PCB detects Unit will stop
voltage/current errors operating.
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
page 106.
Possible cause: Faulty main PCB or wrong capacity setting.
2 Perform a check of the inverter PCB A6P. See
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P or non‑compatible
inverter PCB.
3 Perform a check of the compressor. See
page 82.
Possible cause: Faulty compressor.
4 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.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
2.3.67
"3.2 Compressor" on
Main error code
L1
Trigger
Main PCB detects
voltage/current errors
on output waveform
or current read-out.
To solve the error code
Unit
Main
Sub 1
Sub 2
1 Perform a check of the main PCB. See
2 Perform a check of the inverter PCB A6P. See
Reset
Manual reset via user
3 Perform a check of the compressor. See
interface.
Power reset at
outdoor unit.
4 Check if the power supply is conform with the regulations. See
"3.9 Main PCB" on
"3.8 Inverter
2.3.68
"3.2 Compressor" on
Main error code
L1
L1-21-26-46 – Inverter PCB A6P hardware
fault
Sub error code
21
26
46
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.
Effect
Unit will stop
operating.
INFORMATION
It is recommended to perform the checks in the listed
order.
page 106.
Possible cause: Faulty main PCB or wrong capacity setting.
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P or non‑compatible
inverter PCB.
page 82.
Possible cause: Faulty compressor.
"4.1 Electrical circuit" on page 130.
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.
L1-28-32-34 – Fan inverter PCB A4P
Eeprom error
Sub error code
28
32
34
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.
2 Troubleshooting
Unit
Main
Sub 1
Sub 2
Reset
Manual reset via user
interface.
Power reset at
outdoor unit.
"3.9 Main PCB" on
"3.8 Inverter
"3.2 Compressor" on
Unit
Main
Sub 1
Sub 2
Service manual
37