Daikin Super Multi Plus E-Series - Malfunction of High Pressure Sensor

Troubleshooting for Outdoor Unit SiEN18-622
376 Troubleshooting
7.15 Malfunction of High Pressure Sensor
Remote Control
Display
JA
Applicable
Models
AII outdoor unit models
Method of
Malfunction
Detection
Malfunction is detected from the pressure detected by the high pressure sensor.
Malfunction
Decision
Conditions
When the high pressure sensor is short circuit or open circuit.
Supposed
Causes
 Defect of high pressure sensor
 Connection of low pressure sensor with wrong connection.
 Defect of outdoor unit PCB.
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to “Pressure Sensor”, pressure / voltage characteristics table on P409.
(V2806)
Caution
NO
NO
YES
YES
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The high
pressure sensor is
connected to X17A of
outdoor unit PC
board (A1P).
The
relationship
between the *1
VH and high pressure
is normal (see *2) when
voltage is meaured
between X17A pins (1)
and (3) of outdoor
unit PC board
(A1P)
(see *1).
Connect the high pressure
sensor and turn on again.
Replace outdoor unit PC
board (A1P).
Replace the high pressure
sensor.
Outdoor unit PC board A1P
*2 Measure DC voltage here.
+5V
X17A
Red
Black
White
GND
Microcomputer
A/D input
High pressure sensor