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Troubleshooting
Service manual
161
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
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
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).
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.156 U4-03 – Transmission error between indoor units and system
Trigger
Effect
Reset
Main PCB detects
abnormal transmission on
F1-F2 transmission line to
indoor units.
Unit will stop operating.
Auto reset.
Transmission between
indoor units and outdoor
unit is interrupted while in
initialization.
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
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
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
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
Perform a check of the main PCB. See
290].
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
Possible cause:
External source may cause interference.
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