Low Pressure Sensor Abnormality - Daikin VRV II-Q RQYQ8-48PY1B Service Manual

Troubleshooting by Remote Controller

2.19 Low Pressure Sensor Abnormality

JC
Remote
Controller
Display
Applicable RQYQ-PY1B
Models
Method of Error Error is detected from the pressure detected by the low pressure sensor.
Detection
Error Decision When the low pressure sensor is short circuit or open circuit.
(Not less than 1.77MPa, or -0.01MPa and below)
Conditions
Supposed
Causes
Troubleshooting
132
Defect of low pressure sensor
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PCB
Defective connection of low pressure sensor
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
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 (*1) and
the gauge pressure.)
YES
If the PCB pressure
detection normal? (Make a
comparison between the
checker pressure data and
the voltage characteristics
(*1).)
YES
Reset the operation, and then
restart the outdoor unit.
Are the
characteristics of
the low pressure
sensor normal?
YES
NO
NO
NO
SiBE341027
Replace the low pressure sensor.
Replace the outdoor unit PCB.
Replace the low pressure sensor.
Replace the outdoor unit PCB.
Service Diagnosis