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Troubleshooting
Service manual
54
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
Trigger
Effect
Reset
Expansion valve
overcurrent.
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.
INFORMATION
When the power is switched ON, the outdoor unit main PCB checks all expansion
valve coil windings by current check.
1
Perform a check of the main PCB. See
Possible cause:
Faulty main PCB.
2
Perform a check of the Sub PCB. See
Possible cause:
Faulty Sub PCB.
3
Perform a check of all expansion valves. See
Possible cause:
Faulty expansion valve.
4
Perform
a
check
of
all
refrigerant
side
thermistors.
See
Possible cause:
Faulty refrigerant side thermistor(s).
5
Perform a check of the refrigerant low pressure sensor. See
Possible cause:
Faulty refrigerant low pressure sensor.
6
Check if the refrigerant circuit is correctly charged. See
363].
Possible cause:
Refrigerant overcharge.
7
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.
8
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
372].
Possible cause:
External source may cause interference.
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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