U7-03 - Transmission Abnormality Between Main; Outdoor Unit And Sub 1 Outdoor Unit; U7-04 - Transmission Abnormality Between Main; Outdoor Unit And Sub 2 Outdoor Unit - Daikin VRV IV+ Service Manual

2 Troubleshooting
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed
order.
1 Check if multiple units are wired to the same cool/heat zone
without cool/heat master set. One main PCB needs to be set
cool/heat master (field setting 2‑0 = 1) while all other units need
to be set sub (field setting 2‑0 = 2). See
page 188.
Possible cause: No cool/heat master set when multiple units
are wired to the same cool/heat zone.
2 If unified cool/heat selection is NOT present, set the
DTA104A61,62 cool/heat setting to IND.
3 Check wiring and configuration of option DTA104A61, 62. See
option handbook on Business Portal for more information.
4 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.
2.3.132 U7-03 – Transmission abnormality
between main outdoor unit and sub 1
outdoor unit
Trigger Effect
Main PCB on main Forced stop.
outdoor unit detects
transmission
abnormality on a
multi installation.
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 of the main outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the main outdoor unit.
3 Perform a check of the main PCB of the sub 1 outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the sub 1 outdoor unit.
4 Check that ONLY the master outdoor unit has F1‑F2 IN
connection. If another outdoor unit has F1‑F2 IN connection,
correct the installation.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
Service manual
60
https://daikin-p.ru/catalog/vrv-daikn/naruzhnye-vrv-bloki-daikin
"6.9 Field settings" on
"6.9 Field
Reset
Auto reset.
page 130.
2.3.133 U7-04 – Transmission abnormality
between main outdoor unit and sub 2
outdoor unit
Trigger Effect
Main PCB on main Forced stop.
outdoor unit detects
transmission
abnormality on a
multi installation.
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 of the main outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the main outdoor unit.
3 Perform a check of the main PCB of the sub 2 outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the sub 2 outdoor unit.
4 Check that ONLY the master outdoor unit has F1‑F2 IN
connection. If another outdoor unit has F1‑F2 IN connection,
correct the installation.
INFORMATION
If all procedures listed above have been performed and the
problem is still present, contact the helpdesk.
2.3.134 U7-05 – Multi system abnormality
Trigger Effect
Main PCB on main Forced stop.
outdoor unit detects
transmission
abnormality on a
multi installation.
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 of the main outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the main outdoor unit.
3 Perform a check of the main PCB of the sub 1 outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the sub 1 outdoor unit.
4 Perform a check of the main PCB of the sub 2 outdoor unit. See
"3.9 Main PCB" on page 106.
Possible cause: Faulty main PCB of the sub 2 outdoor unit.
Reset
Auto reset.
page 130.
Reset
Auto reset.
page 130.
RYYQ+RYMQ+RXYQ8~20U7Y1B
VRV IV+ Heat Pump
ESIE18-14 – 2019.07