Daikin R407C PLUS - Outdoor Unit: Malfunction of Discharge Pipe Pressure Sensor

Si33-105 Troubleshooting
Troubleshooting R407C PLUS Series Heat Recovery System 179
3.23 Outdoor Unit: Malfunction of Discharge Pipe Pressure
Sensor
Remote
Controller
Display
JA
Supposed
Causes
!
Defect of high pressure sensor system
!
Connection of low 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 P243.
(VF049)
The
relationship
between the H 1
VH and high pressure
is normal (see H 2) when
voltage is measured between
X22A pins (1) and (3) of
outdoor unit PC
board (A1P)
(see H 1).
Replace the high pressure sensor.
Connect the high pressure sensor
and turn on again.
NO
NO
Replace outdoor unit PC board
A1P.
YES
YES
The high
pressure sensor is
connected to X22A (red) of
outdoor unit PC
board (A1P).
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.