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Troubleshooting
Service manual
182
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
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.
2.3.194 UF-05 – Wiring and piping mismatch - Stop valves closed or incorrect
Trigger
Effect
Reset
Minimum 1 indoor unit
fails to perform cross pipe
check during test run.
Forced stop.
Perform 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
363].
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
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
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.
Summary of Contents for VRV IV+
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