Low Pressure Sensor Abnormality - Daikin REYQ-XA Service Manual

Troubleshooting by Error Code

3.48 Low Pressure Sensor Abnormality

JC
Error Code
Applicable
All outdoor unit models
Models
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 (0-247 psi))
Supposed
Causes
Troubleshooting
CHECK 12
317
Defective low pressure sensor
Connection of high pressure sensor in mistake for low pressure sensor
Defective outdoor unit main PCB
Defective connection of low pressure sensor
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 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 operation.
Are the
characteristics of the
low pressure sensor
normal?
YES
Refer to page 388.
NO
NO
NO
SiUS371901E
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).
Service Diagnosis