SiAF341904E
Troubleshooting by Error Code
Part 6 Service Diagnosis
239
Reference
5.35 Low Pressure Sensor Abnormality
Applicable
Models
All outdoor unit models
Error Code
JC
Method of Error
Detection
Detect according to temperature detected with the low pressure sensor.
Error Decision
Conditions
The low pressure sensor is short circuit or open circuit.
(Pressure range: 0-1.7 MPa)
Supposed
Causes
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
Troubleshooting
CHECK 12
Refer to page 298.
Are the
characteristics of
the low pressure
sensor normal? (Make a
comparison between voltage
characteristics and gauge
pressure.)
Replace the low pressure sensor
(S1NPL).
Replace the outdoor unit main
PCB (A1P).
NO
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.
Replace the outdoor unit main
PCB (A1P).
NO
Are the
characteristics of the low
pressure sensor
normal?
Replace the low pressure sensor
(S1NPL).
NO
YES
YES
YES
Reset the operation, and then
restart it.
(1) Mount a pressure gauge on the
low 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
