2.3.112 U1-01-05-07 - Reverse Phase Detection; 2.3.113 U1-04-06-08 - Reverse Phase Detection; U2-01-08-11 - Inverter Circuit Power Supply Abnormality - Inverter Pcb A3P Abnormal Voltage - Daikin VRV IV+ Service Manual

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7 Check if the refrigerant circuit is correctly charged. See
"4.2 Refrigerant circuit" on page 133.
Possible cause: Refrigerant shortage.
8 Perform a check of the refrigerant high pressure sensor. See
"3.15 Refrigerant high pressure sensor" on
Possible cause: Faulty refrigerant high pressure sensor.
9 Perform a check of the compressor. See
page 82.
Possible cause: Faulty compressor.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.112 U1-01-05-07 – Reverse phase detection
Main error code Sub error code
U1 01
05
07
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 Forced stop.
reverse phase
between L1 - L3
phases.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check the phase sequence on the mains power supply
terminal, see "To check the power supply of the unit" in
"4.1 Electrical circuit" on page 130. Correct if needed.
Possible cause: Incorrect phase sequence on mains power
supply terminal.
2 Check if any of the phases is missing on the mains power
supply terminal, see "To check the power supply of the unit" in
"4.1 Electrical circuit" on page 130. Correct if needed.
Possible cause: Missing phase(s) on mains power supply
terminal.
3 Check if the phase L3 is present on the power supply connector
X1A on the main PCB, see "To perform a power check" in
"3.9 Main PCB" on page 106. Correct if needed.
Possible cause: Missing phase L3 on main PCB power
supply connector.
4 Perform a check of the fuses of the main PCB, see
PCB" on page 106.
Possible cause: Blown fuse(s) on main PCB.
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
2.3.113 U1-04-06-08 – Reverse phase detection
Main error code
U1
page 124.
"3.2 Compressor" on
Trigger
Main PCB detects
reverse phase
between L1 - L3
Unit
phases.
Main
To solve the error code
Sub 1
Sub 2
1 Check the phase sequence on the mains power supply
Reset
2 Check if any of the phases is missing on the mains power
Power reset at
outdoor unit.
3 Check if the phase L3 is present on the power supply connector
4 Perform a check of the fuses of the main PCB, see
2.3.114 U2-01-08-11 – Inverter circuit power
Main error code
U2
"3.9 Main
Sub error code
04
06
08
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
Forced stop.
INFORMATION
It is recommended to perform the checks in the listed
order.
terminal, see "To check the power supply of the unit" in
"4.1 Electrical circuit" on page 130. Correct if needed.
Possible cause: Incorrect phase sequence on mains power
supply terminal.
supply terminal, see "To check the power supply of the unit" in
"4.1 Electrical circuit" on page 130. Correct if needed.
Possible cause: Missing phase(s) on mains power supply
terminal.
X1A on the main PCB, see "To perform a power check" in
"3.9 Main PCB" on page 106. Correct if needed.
Possible cause: Missing phase L3 on main PCB power
supply connector.
PCB" on page 106.
Possible cause: Blown fuse(s) on main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
supply abnormality - inverter PCB A3P
abnormal voltage
Sub error code
01
08
11
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
Power reset at
outdoor unit.
"3.9 Main
Unit
Main
Sub 1
Sub 2
Service manual
53