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Troubleshooting
Service manual
148
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Effect
Reset
Open phase detected by
phase detection circuit.
Unit will stop operating.
Power reset at outdoor
unit.
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
356].
Possible cause:
▪
Faulty or disturbance of the power supply (imbalance >10%),
▪
Power drop,
▪
Short circuit.
2
Perform a check of the noise filter PCB. See
Possible cause:
Faulty noise filter PCB.
3
Perform a check of the inverter PCB(s). See
274].
Possible cause:
Faulty inverter PCB(s).
INFORMATION
If all procedures listed above have been performed and the problem is still present,
contact the helpdesk.
2.3.141 U1-19-20-21 – Hz error detection on Power Supply
Main error code
Sub error code
Unit
U1
19
Main
20
Sub 1
21
Sub 2
INFORMATION
Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit
configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is
connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting
1‑00.
Trigger
Effect
Reset
Main PCB does not detect
zero-crossing for a certain
duration.
Unit will stop operating.
Power reset at outdoor
unit.
Summary of Contents for VRV IV+
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