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Troubleshooting
Service manual
145
REYQ8~20+REMQ5U7Y1B
VRV IV+ Heat Recovery
ESIE18-15B – 2020.05
2.3.137 U0-08-09-10 – Refrigerant shortage detection by high pressure sensor
Main error code
Sub error code
Unit
U0
08
Main
09
Sub 1
10
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
Refrigerant shortage
detection.
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.
Summary of Contents for VRV IV+
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