Low Pressure Sensor Abnormality - Daikin VRV EMERION REYQ-AATJA Service Manual

SiUS372201EB

3.53 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 (0-247 psi))
Supposed
 Defective low pressure sensor
Causes  Connection of high pressure sensor in mistake for low pressure sensor
 Defective outdoor unit main PCB
 Defective connection of low pressure sensor
Troubleshooting
Reference
CHECK 12 Refer to page 463.
Part 6 Service Diagnosis
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.
Check 12
Are the
characteristics of
the low pressure sensor
normal? (Make a comparison
between voltage
characteristics and
gauge pressure.)
YES
Check 12
Is the PCB
detection pressure
normal? Make a comparison
between data on pressure checked
by the Service Checker and
the voltage
characteristics.
YES
Reset the operation, and then
restart operation.
Are the
characteristics of the low
pressure sensor normal?
YES
NO
NO
NO
Troubleshooting by Error Code
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).
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