Daikin VRV IV+ Service Manual page 165

2.3.161 U7-04 – Transmission abnormality between main outdoor unit and sub 2 outdoor unit
2.3.162 U7-05 – Multi system abnormality
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Main PCB on main
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" [
Possible cause: Faulty or interruption in communication between outdoor
units.
2 Perform a check of the main PCB of the main outdoor unit. See
4
PCB" [ 290].
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
4
PCB" [ 290].
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.
Trigger
Main PCB on main
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" [
Possible cause: Faulty or interruption in communication between outdoor
units.
2 Perform a check of the main PCB of the main outdoor unit. See
PCB" [ 4 290].
Possible cause: Faulty main PCB of the main outdoor unit.
Effect
Forced stop.
4
356].
Effect
Forced stop.
4
356].
2 Troubleshooting
|
Reset
Auto reset.
"3.11 Main
"3.11 Main
Reset
Auto reset.
"3.11 Main
Service manual
165