Low Pressure Sensor Abnormality - Daikin VRV RXYMQ-A Series Service Manual

Troubleshooting by Error Code

5.38 Low Pressure Sensor Abnormality

Applicable All outdoor unit models
Models
JC
Error Code
Method of Error
Detect according to temperature detected with the low pressure sensor.
Detection
Error Decision
The low pressure sensor is short circuit or open circuit.
Conditions (Pressure range: 0-1.7 MPa)
Supposed  Defective low pressure sensor
 Connection of high pressure sensor in mistake for low pressure sensor
Causes
 Defective outdoor unit main PCB
 Defective connection of low pressure sensor
Troubleshooting
Reference
CHECK 12 Refer to page 284.
218
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
(1) Mount a pressure gauge on the
low pressure service port.
(2) Connect the Service Checker for
VRV systems.
Are the
characteristics of
the low pressure
sensor normal? (Make a
comparison between voltage
characteristics and gauge
pressure.)
CHECK 12
YES
Is the
outdoor unit main
PCB detection pressure
normal? Make a comparison
between data on pressure checked by
the Service Checker and the
voltage characteristics.
CHECK 12
YES
Reset the operation, and then
restart it.
Are the
characteristics of the low
pressure sensor
normal?
YES
NO
NO
NO
SiME332106E
Replace the low pressure sensor
(S1NPL).
Replace the outdoor unit main
PCB (A1P).
Replace the low pressure sensor
(S1NPL).
Replace the outdoor unit main
PCB (A1P).
Part 6 Service Diagnosis