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Troubleshooting
Service manual
143
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
To solve the error code
1
Refer to U0-05 or U0-06 to proceed.
2.3.135 U0-05 – Refrigerant shortage detection
Trigger
Effect
Reset
Refrigerant shortage
detection during cooling.
Unit keeps running.
Auto reset.
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
Possible cause:
Closed stop valve in the refrigerant circuit.
2
Perform a check of all expansion valves. See
244].
Possible cause:
Faulty expansion valve.
3
Perform a check of the refrigerant low pressure sensor. See
Possible cause:
Faulty refrigerant low pressure sensor.
4
Perform
a
check
of
the
suction
pipe
thermistor.
See
348].
Possible cause:
Faulty suction pipe thermistor or connector fault.
5
Perform
a
check
of
the
discharge
pipe
thermistor.
See
348].
Possible cause:
Faulty discharge pipe thermistor or connector fault.
6
Check for the presence of non‑condensables and/or humidity in the
refrigerant circuit. See
363].
Possible cause:
Non‑condensables and/or humidity in the refrigerant circuit.
7
Check if the refrigerant circuit is correctly charged. See
Possible cause:
Refrigerant shortage.
8
Perform a check of the refrigerant high pressure sensor. See
Possible cause:
Faulty refrigerant high pressure sensor.
9
Perform a check of the compressor. See
221].
Possible cause:
Faulty compressor.
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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