Daikin VRV III REYQ10PY1B, Service Manual

Page: 314 / 472

SiBE37-701 Troubleshooting by Indication on the Remote Controller
Troubleshooting 303
3.34
“
JC
”
Outdoor Unit: Malfunction of Low Pressure Sensor
Remote
Controller
Display
JC
Applicable
Models REYQ8P~48P
Method of
Malfunction
Detection Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions When the low pressure sensor is short circuit or open circuit.
(Not less than 1.77MPa, or -0.01MPa and below)
Supposed
Causes
„
Defect of low pressure sensor system
„
Connection of high pressure sensor with wrong connection.
„
Defect of outdoor unit PC board.
„
Defective connection of low pressure sensor
Troubleshooting
(V2808)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Replace the main PC board.
Replace the low pressure sensor.
YES
NO
Replace the main PC board.
NO
Replace the low pressure sensor.
YES
NO
Are the
characteristics of
the low pressure sensor
normal? (Make a comparison
between the voltage characteristics
(
∗
1) and the gauge
pressure.)
YES
If the
PC board pressure
detection normal?
(Make a comparison between the
checker pressure data and the
voltage characteristics
(
∗
1).)
1.Set the low pressure gauge
upright.
2.Connect the checker for
VRV to the gauge.
Confirm which low pressure
sensor is abnormal using
outdoor unit "monitor mode".
(Refer to P248~249)
Reset the operation, and then
restart the outdoor unit.
Are the
characteristics of the low
pressure sensor
normal?