Daikin VRV IV+ Service Manual page 182

2 | Troubleshooting
2.3.194 UF-05 – Wiring and piping mismatch - Stop valves closed or incorrect
Service manual
182
Possible cause: Power black‑out or malfunctioning PCB on indoor unit(s).
5 Perform a check of the indoor unit pipe thermistors, see service manual of the
respective indoor unit(s) for more information.
Possible cause: Faulty indoor unit pipe thermistor.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Trigger
Minimum 1 indoor unit
fails to perform cross pipe
check during test run.
To solve the error code
INFORMATION
It is recommended to perform the checks in the listed order.
1 Check that all stop valves of the refrigerant circuit are open. See
"4.2 Refrigerant circuit" [
Possible cause: Closed stop valve in the refrigerant circuit.
2 Check that the refrigerant circuit piping and wiring connections of the system
are correctly installed.
Possible cause: Refrigerant piping and/or wiring mismatch.
3 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).
4 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).
5 Perform a check of the indoor unit pipe thermistors, see service manual of the
respective indoor unit(s) for more information.
Possible cause: Faulty indoor unit pipe thermistor.
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
Effect
Forced stop.
4
363].
Reset
Perform test run.
"6.9 Field
"6.9 Field
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05