SiUS342004EB
Troubleshooting by Error Code
Part 6 Service Diagnosis
286
Reference
Reference
3.35 Activation of Low Pressure Sensor
Applicable
Models
All outdoor unit models
Error Code
E4
Method of Error
Detection
Make judgment of pressure detected by the low pressure sensor with the outdoor unit main PCB.
Error Decision
Conditions
When low pressure caused a drop while the compressor is in operation:
Operating pressure: 0.07 MPa (10.2 psi)
Supposed
Causes
Abnormal drop in low pressure
Defective low pressure sensor
Defective outdoor unit main PCB
The stop valve is not opened
Troubleshooting
CHECK 2
Refer to page 358.
CHECK 12
Refer to page 369.
YES
NO
(1) Mount a pressure gauge on the low pressure service port.
(2) Reset the operation using the remote controller, and then restart the operation.
Is the stop valve open?
Open the stop valve.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Replace the outdoor unit
main PCB (A1P).
NO
YES
Are both
pressure values the
same?
-The low pressure sensor is normal, and outdoor unit main PCB is also
normal.
-The low pressure has really become low.
CHECK 2
: Eliminate factors that cause the low pressure to fall.
Connect the service checker, and then compare the low pressure value
measured by the service checker with the voltage measurement of the
connector of the pressure sensor (
1)
Service Checker
CHECK 12
Replace the low pressure sensor
(S1NPL).
NO
Compare the voltage
measurement of the connector of the
pressure sensor (
1) with the measurement
of the pressure gauge. Are the
characteristics of the low
pressure sensor
normal?
CHECK 12
YES
(
1)
Use the table on
CHECK 12
to
convert the voltage measurement into
pressure measurement.
Summary of Contents for VRV RXYQ72-384XAYCA
Page 1: ...Service Manual RXYQ72 384XAYCA RXYQ72 384XBYCA Heat Pump 60 Hz SiUS342004EB...
Page 395: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 388 FXFQ07 09 12 15 18 24 30 36 48TVJU 3D086460B...
Page 397: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 390 FXZQ05 07 09 12 15 18TAVJU 3D110443A...
Page 401: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 394 FXEQ07 09 12 15 18 24PVJU 3D098557A...
Page 402: ...Wiring Diagrams SiUS342004EB 395 Part 7 Appendix FXDQ07 09 12 18 24MVJU C 3D050501C...
Page 409: ...SiUS342004EB Wiring Diagrams Part 7 Appendix 402 FXHQ12 24 36MVJU 3D048116C...
Page 410: ...Wiring Diagrams SiUS342004EB 403 Part 7 Appendix FXAQ07 09 12 18 24PVJU 3D075354F...
Page 418: ...Wiring Diagrams SiUS342004EB 411 Part 7 Appendix VAM1200GVJU 3D073270D...