U2-22-25-28 - Inverter Circuit Power Supply Abnormality - Inverter Pcb A6P Abnormal Voltage; U2-23-26-29 - Inverter Circuit Power Supply Abnormality - Inverter Pcb A6P Phase Loss - Daikin VRV IV+ Service Manual

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Trigger Effect
Inverter PCB A3P Unit will stop
detects DC voltage operating.
cannot reach or
maintain minimum
500 V DC.
No zero cross is
detected by main
PCB through at least
10 seconds.
Abnormal voltage
drop is detected by
DC voltage detection
circuit.
Abnormal voltage rise
is detected by over
voltage detection
circuit.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check if the power supply wiring is correct. See
circuit" on page 130.
Possible cause: Incorrect power supply wiring.
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.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.117 U2-22-25-28 – Inverter circuit power
supply abnormality - inverter PCB A6P
abnormal voltage
Main error code Sub error code
U2 22
25
28
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.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
Reset Trigger
Power reset at Inverter PCB A6P
outdoor unit. detects DC voltage
cannot reach or
maintain minimum
500 V DC.
No zero cross is
detected by main
PCB through at least
10 seconds.
Abnormal voltage
drop is detected by
DC voltage detection
circuit.
Abnormal voltage rise
is detected by over
voltage detection
circuit.
To solve the error code
"4.1 Electrical 1 Check if the power supply wiring is correct. See
"3.10 Noise 2 Perform a check of the noise filter PCB A5P. See
"3.8 Inverter 3 Perform a check of the inverter PCB A6P. See
"6.2 Wiring 4 Check the wiring between the PCB's. See
2.3.118 U2-23-26-29 – Inverter circuit power
Unit Main error code
Main U2
Sub 1
Sub 2
Effect
Unit will stop
operating.
INFORMATION
It is recommended to perform the checks in the listed
order.
circuit" on page 130.
Possible cause: Incorrect power supply wiring.
filter PCB" on page 110.
Possible cause: Faulty noise filter PCB A5P.
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P.
diagram" on page 146.
Possible cause: Faulty wiring between PCB's.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
supply abnormality - inverter PCB A6P
phase loss
Sub error code
23
26
29
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
Reset
Power reset at
outdoor unit.
"4.1 Electrical
"3.10 Noise
"3.8 Inverter
"6.2 Wiring
Unit
Main
Sub 1
Sub 2
Service manual
55