Service Manual

SiUS281811E Troubleshooting by Error Codes
Part 6 Service Diagnosis 235
Reference
4.38 Low Pressure Sensor Abnormality
Error Code JC
Applicable
Models
All outdoor units
Method of Error
Detection
Error is detected from pressure detected by low pressure sensor.
Error Decision
Conditions
The low pressure sensor is short circuit or open circuit.
Pressure range: 0-1.7 MPa (0-247 psi)
Supposed
Causes
 Defective low pressure sensor
 Connection of high pressure sensor with wrong connection
 Defective outdoor main PCB
 Disconnection of low pressure sensor
Troubleshooting
CHECK 12 Refer to page 273.
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Are the characteristics of
the low pressure sensor normal?
(Make a comparison between the
voltage characteristics and the
gauge pressure.)
Is the PCB pressure detection
normal? (Make a comparison
between the checker pressure
data and the voltage
characteristics.)
Replace the outdoor main PCB
(A1P).
Replace the low pressure sensor
(S1NPL).
YES
NO
Replace the outdoor main PCB
(A1P).
NO
Replace the low pressure sensor
(S1NPL).
YES
NO
YES
Reset the operation, and then
restart the outdoor unit.
Are the
characteristics of the
low pressure sensor
normal?
CHECK 12
CHECK 12
YES
Connect the low pressure sensor
(S1NPL) correctly and then restart
operation.
NO
Does the
low pressure
sensor connect to the
designated connector of the
outdoor main PCB
(A1P)?