Daikin REYQ-AATJA, Service Manual, Page: 375 / 495

SiUS372201EA Troubleshooting by Error Code
Part 6 Service Diagnosis 368
Reference
3.51 High Pressure Sensor Abnormality
Applicable
Models
All outdoor unit models
Error Code
JA
Method of Error
Detection
Detects according to temperature detected with the high pressure sensor.
Error Decision
Conditions
The high pressure sensor is short circuit or open circuit.
(Pressure range: 0-4.3 MPa (0-624 psi))
Supposed
Causes
 Defective high pressure sensor

Connection of low pressure sensor in mistake for high pressure sensor
 Defective outdoor unit main PCB
 Defective connection of high pressure sensor
Troubleshooting
CHECK 12 Refer to page 437.
Are the
characteristics
of the high pressure
sensor normal? (Make a
comparison between voltage
characteristics and gauge
pressure.)
Replace the high pressure sensor
(S1NPH).
Replace the outdoor unit main PCB
(A1P).
NO
Is the PCB
detection pressure
normal? Make a
comparison between data on
pressure checked by the Service
Checker and the voltage
characteristics.
Replace the outdoor unit main PCB
(A1P).
NO
Are the
characteristics of the
high pressure sensor
normal?
Replace the high pressure sensor
(S1NPH).
NO
YES
YES
YES
Reset the operation, and restart
operation.
(1) Mount a pressure gauge on the
high pressure service port.
(2) Connect the Service Checker for
VRV systems.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 12
CHECK 12