Troubleshooting by Error Code
SiAF332111E
296
Part 6 Service Diagnosis
Note(s)
Reference
Reference
5.55.3 Refrigerant Shortage (10/12 HP Models)
Applicable
Models
RXMQ10/12AR
Error Code
U0
Method of Error
Detection
Refrigerant shortage check is conducted based on the discharge pipe thermistor temperature
and the low-pressure saturated temperature.
Error Decision
Conditions
Low pressure becomes 0.1 MPa or below.
Supposed
Causes
Refrigerant shortage or refrigerant clogging (piping error)
Defective thermistor
Defective low pressure sensor
Defective outdoor unit main PCB (A1P)
Troubleshooting
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.
CHECK 2
Refer to page 338.
CHECK 12
Refer to page 353.
Check if the low
pressure is 0.1 MPa or
below. (
1)
Check if the property of
low pressure sensor
is normal.
(
2)
Replace the low pressure
sensor.
Replace the outdoor unit main
PCB (A1P).
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
NO
NO
YES
YES
Eliminate factors that cause
decreasing low pressure by
referring to
CHECK 2
.
(1) Set up a pressure gauge at the service port on the low
pressure side.
(2) Reset the operation using the remote controller then restart.
CHECK 12
Summary of Contents for VRV S RXMQ10ARY1
Page 1: ...Service Manual Cooling Only 50 60 Hz RXQ4 5ARV1 RXMQ6ARV1 RXMQ8 10 12ARY1 SiAF332111E...
Page 369: ...SiAF332111E Wiring Diagrams Part 7 Appendix 363 RXMQ6ARV1 C 3D137051...
Page 370: ...Wiring Diagrams SiAF332111E 364 Part 7 Appendix RXMQ8ARY1 C 3D137060...
Page 371: ...SiAF332111E Wiring Diagrams Part 7 Appendix 365 RXMQ10 12ARY1 3D121610B...
Page 375: ...SiAF332111E Wiring Diagrams Part 7 Appendix 369 FXMQ40 50 63 80 100ARV1 3D127112 04 59...