Daikin VRV R-407C PLUS Series, Service Manual

Page: 157 / 193

Troubleshooting SiE 00-07
146 Troubleshooting R-407C PLUS Series
3.24 Outdoor Unit: Malfunction of Suction Pipe Pressure Sensor
Remote Controller
Display
JC
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 P204.
(VF050)
The
relationship
between the
∗
1
VH and low pressure is
normal (see
∗
2) when voltage
is measured between X21A 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 X21A (blue)
of outdoor unit PC
board (A1P).