U4-15 - Unable To Start Test Run; U7-01 - Transmission Abnormality Between Systems - Dta104A61,62 Error; U7-02 - Transmission Abnormality Between Systems - Dta104A61,62 Error - Daikin VRV IV+ Service Manual

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To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 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.
2 Check the F1‑F2 transmission line between the indoor units and
outdoor unit. See "4.1 Electrical circuit" on
Possible cause: Faulty or interruption in transmission line
between indoor units and outdoor unit.
3 Check field setting 1‑10 to count the indoor units, see
settings" on page 188. If less indoor units detected than it
should be, check the indoor unit(s) that have power black‑out or
malfunctioning PCB. See service manual of the respective
indoor unit for more information.
Possible cause: Power black‑out or malfunctioning PCB on
indoor unit(s).
4 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
5 Perform a power reset. If the error disappears and is raised
again after a while, check for the presence of an external
source causing electrical noise. See
page 138.
Possible cause: External source may cause interference.
6 Set field setting 2‑5 of the outdoor unit to 1 to start the indoor
units connected to that outdoor unit on forced fan operation,
see "6.9 Field settings" on page 188. If any of these indoor units
is NOT operating, check the indoor unit(s) that have power
black‑out or malfunctioning PCB. See service manual of the
respective indoor unit for more information.
Possible cause: Power black‑out or malfunctioning PCB on
indoor unit(s).
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.129 U4-15 – Unable to start test run
Trigger Effect
Main PCB detects Test run will NOT
malfunction on indoor start.
unit(s).
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Set field setting 2‑5 of the outdoor unit to 1 to start the indoor
units connected to that outdoor unit on forced fan operation,
see "6.9 Field settings" on page 188. If any of these indoor units
is NOT operating, check the indoor unit(s) that have power
black‑out or malfunctioning PCB. See service manual of the
respective indoor unit for more information.
Possible cause: Power black‑out or malfunctioning PCB on
indoor unit(s).
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07
page 130.
"6.9 Field
"3.9 Main PCB" on
"4.3 External factors" on
Reset
Perform test run.
2 Check field setting 1‑10 to count the indoor units, see
settings" on page 188. If less indoor units detected than it
should be, check the indoor unit(s) that have power black‑out or
malfunctioning PCB. See service manual of the respective
indoor unit for more information.
Possible cause: Power black‑out or malfunctioning PCB on
indoor unit(s).
3 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.130 U7-01 – Transmission abnormality
between systems - DTA104A61,62 error
Trigger Effect
Communication Unit will stop
problem between operating.
systems.
Conflict in settings Unit keeps running.
and configuration for
DTA104A61,62.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check the Q1‑Q2 communication between the outdoor units.
See "4.1 Electrical circuit" on
Possible cause: Faulty or interruption in communication
between outdoor units.
2 Perform a check of the main PCB. See
page 106.
Possible cause: Faulty main PCB.
3 Check wiring and configuration of option DTA104A61, 62. See
option handbook on Business Portal for more information.
4 Check the F1‑F2 OUT transmission line between the outdoor
unit main PCB and option PCB DTA104A61, 62. See
"4.1 Electrical circuit" on page 130.
Possible cause: Faulty or interruption in transmission line
between outdoor unit and option DTA104A61, 62.
5 Check that ONLY the master outdoor unit has F1‑F2 IN
connection. If another outdoor unit has F1‑F2 IN connection,
correct the installation.
6 Check if low noise operation or demand control is active without
an optional DTA104A61,62 PCB. Field setting 2‑12 CANNOT
be set to 1 if DTA104A61,62 is not present, see
settings" on page 188.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.131 U7-02 – Transmission abnormality
between systems - DTA104A61,62 error
Trigger Effect
Transmission error on Forced stop.
DTA104A61,62
initialization.
2 Troubleshooting
"6.9 Field
"3.9 Main PCB" on
Reset
Auto reset when
communication is
normal.
Auto reset when
correct settings apply
on DTA104A61,62.
page 130.
"3.9 Main PCB" on
"6.9 Field
Reset
Auto reset.
Service manual
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