Daikin VRV II REYQ8MY1B, Service Manual

Page: 196 / 309

Si39-306 Troubleshooting by Indication on the Remote Controller
Troubleshooting 185
2.33
“
JC
”
Outdoor Unit: Malfunction of Suction Pipe Pressure
Sensor
Remote
Controller
Display
JC
Applicable
Models REYQ8~48M
Method of
Malfunction
Detection Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Decision
Conditions When the suction pipe pressure sensor is short circuit or open circuit.
Supposed
Causes
„
Defect of low pressure sensor system
„
Connection of high pressure sensor with wrong connection.
„
Defect of outdoor unit PC board.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to pressure sensor, pressure/voltage characteristics table on P.277.
(V2808)
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The
relationship
between the
∗
1
VH and low pressure is
normal (see
∗
2) when voltage
is measured between X45A pins
(2) and (3) of outdoor unit
PC board (A1P)
(see
∗
1).
Replace the low pressure sensor.
Connect low pressure sensor
property and restart system.
NO
NO
Replace outdoor unit PC board
A1P.
YES
YES
The low
pressure sensor is
connected to X45A (blue)
of outdoor unit PC
board (A1P).