Daikin VRV IV+ Service Manual page 184

2 | Troubleshooting
2.3.197 UH-02 – Auto-address failure
Service manual
184
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
4
settings" [ 455]. 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).
2 Perform a communication reset of the F1‑F2 transmission, see
4
circuit" [ 356].
3 Check field setting 1‑10 to count the indoor units, see
4
settings" [ 455]. 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 Check if the power supply is conform with the regulations. See
4
circuit" [ 356].
Possible cause:
▪ Faulty or disturbance of the power supply (imbalance >10%),
▪ Power drop,
▪ Short circuit.
5 Check the F1‑F2 transmission line between the indoor units and outdoor unit.
See "4.1 Electrical
Possible cause: Faulty or interruption in transmission line between indoor
units and outdoor unit.
6 Check for improper combination of units. See the combination table in the
Databook for more information. Change the installation with ONLY compatible
type units.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Main PCB detects
improper combination at
indoor unit side.
Missing auto address of
indoor unit(s) after
initialization.
4
circuit" [ 356].
Effect
Forced stop.
"6.9 Field
"4.1 Electrical
"6.9 Field
"4.1 Electrical
Reset
Reset communication
from main PCB.
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05