Troubleshooting by Error Code
SiUS341802EC
333
Part 6 Service Diagnosis
Note(s)
Reference
Reference
3.62 Refrigerant Shortage
Applicable
Models
All outdoor unit models
Error Code
U0
Method of Error
Detection
Detect refrigerant shortage according to a low pressure level or a difference in heat exchanging
temperature from the suction pipe.
Error Decision
Conditions
Low pressure becomes 0.1 MPa (14.5 psi) or less.
Error is not determined. The unit continues the operation.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (wrong piping)
Defective thermistor
Defective low pressure sensor
Defective outdoor unit main PCB
Troubleshooting
CHECK 2
Refer to page 368.
CHECK 12
Refer to page 383.
Is the low
press
u
re 0.1 MPa
(14.5 psi) or less?
(
∗
1)
Is the
characteristics of
low press
u
re sensor
normal? (
∗
2)
Replace the low press
u
re
sensor (S1NPL).
Replace the o
u
tdoor
u
nit
main PCB (A1P).
NO
NO
YES
YES
Eliminate factors that ca
u
se
decreasing low press
u
re.
CHECK 2
Caution
Be s
u
re to t
u
rn off the power switch
b
efore connecting or disconnecting
connectors, or parts may
b
e damaged.
(1) Mo
u
nt a press
u
re ga
u
ge at the ser
v
ice port on the low
press
u
re side.
(2) Reset the operation
u
sing the remote controller then
restart.
1. Check the low pressure value by using pressure gauge in operation.
2. Compare the actual measurement value by pressure sensor with the value by the
pressure gauge.
(To gain actual measurement value by pressure sensor, measure the voltage at the
connector [between (2)-(3)] and then convert the value into pressure.
CHECK 12
)
Summary of Contents for VRV Aurora RXLQ-TATJU Series
Page 407: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 400 RXLQ96 120TATJU RXLQ96 120TATJA 2D112581C...
Page 409: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 402 RXLQ72TAYDU RXLQ72TAYDA 2D112582D...
Page 411: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 404 RXLQ96 120TAYDU RXLQ96 120TAYDA 2D112583D...
Page 417: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 410 FXFQ07 09 12 15 18 24 30 36 48TVJU 3D086460B...
Page 420: ...Wiring Diagrams SiUS341802EC 413 Part 7 Appendix FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 425: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 418 FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 426: ...Wiring Diagrams SiUS341802EC 419 Part 7 Appendix FXDQ07 09 12 18 24MVJU C 3D050501C...
Page 433: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 426 FXHQ12 24 36MVJU 3D048116C...
Page 434: ...Wiring Diagrams SiUS341802EC 427 Part 7 Appendix FXAQ07 09 12 18 24PVJU 3D075354F...
Page 441: ...SiUS341802EC Wiring Diagrams Part 7 Appendix 434 VAM1200GVJU 3D073270D...
