U2-24-27-30 - Inverter Circuit Power Supply Abnormality - Inverter Pcb A6P Dc Circuit Not Charging; 2.3.120 U3-02 - Test Run Interrupted Manually - Daikin VRV IV+ Service Manual

2 Troubleshooting
Trigger Effect
Inverter PCB A6P 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 A5P. See
filter PCB" on page 110.
Possible cause: Faulty noise filter PCB A5P.
3 Perform a check of the inverter PCB A6P. See
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P.
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.
2.3.119 U2-24-27-30 – Inverter circuit power
supply abnormality - inverter PCB A6P DC
circuit not charging
Main error code Sub error code
U2 24
27
30
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.
Service manual
56
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
Reset
Power reset at
outdoor unit.
"4.1 Electrical
"3.10 Noise
"3.8 Inverter
"6.2 Wiring
Unit
Main
Sub 1
Sub 2
Trigger Effect
Inverter PCB A6P 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 A5P. See
filter PCB" on page 110.
Possible cause: Faulty noise filter PCB A5P.
3 Perform a check of the inverter PCB A6P. See
PCB" on page 99.
Possible cause: Faulty inverter PCB A6P.
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.
2.3.120 U3-02 – Test run interrupted manually
Trigger Effect
Test run interrupted Warning.
manually by user on
main PCB.
Leak detection or
refrigerant amount
check has NOT been
performed.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check if communication between outdoor unit and indoor units
is initialised. Check field setting 1‑10 for count of indoor units,
see "6.9 Field settings" on
than expected, communication between 1 or more indoor unit(s)
and outdoor unit is NOT correct. Check the F1‑F2 transmission
line between the indoor unit and outdoor unit, see
circuit" on page 130.
Reset
Power reset at
outdoor unit.
"4.1 Electrical
"3.10 Noise
"3.8 Inverter
"6.2 Wiring
Reset
Perform test run.
page 188. If less indoor units shown
"4.1 Electrical
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07