Low Pressure Sensor Abnormality - Daikin VRV-WIII RWEYQ72PTJU Service Manual

Troubleshooting by Indication on the Remote Controller

3.28 Low Pressure Sensor Abnormality

JC
Error Code
Applicable RWEYQ72P, 84P
Models
Method of Error
Error is detected from pressure detected by low pressure sensor.
Detection
Error Decision
When the low pressure sensor is short circuit or open circuit
(Not less than 256.65 psi, or -1.45 psi and below)
Conditions
 Defective low pressure sensor system
Supposed
 Connection of high pressure sensor with wrong connection
Causes
 Defective condensing unit PCB
 Defective connection of low pressure sensor
Troubleshooting
198
Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
1. Mount the low pressure
gauge.
2. Connect the checker for
VRV.
Are the
characteristics of
the low pressure
sensor normal? (Make a
comparison between the
voltage characteristics and
the gauge pressure.)
CHECK 14
YES
If the
PCB
pressure
detection normal?
(Make a comparison
between the checker
pressure data and the
voltage characteristics.)
CHECK 12
YES
Reset the operation, and then
restart the condensing unit.
Are the
characteristics of the
low pressure sensor
normal?
YES
NO
NO
NO
SiUS30-1301
Replace the low pressure sensor.
Replace the condensing unit PCB.
Replace the low pressure sensor.
Replace the condensing unit PCB.
Service Diagnosis