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

SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 377
7.16 Malfunction of Low Pressure Sensor
Remote Control
Display
JC
Applicable
Models
AII outdoor unit models
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.
Supposed
Causes
 Defect of low pressure sensor
 Connection of high 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.
(V2808)
Caution
NO
NO
YES
YES
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
The low
pressure sensor is
connected to X18A
(blue)of outdoor unit PC
board (A1P).
The
relationship
between the *1
VL and low pressure is
normal (see *2) when voltage
is measured between X18A
pins (2) and (3) of outdoor
unit PC board
(A1P)
(see *1)
Connect low pressure
sensor property and
restart system.
Replace outdoor unit PC
board (A1P).
Replace the low pressure
sensor.
Outdoor unit PC board A1P
+5V
Microcomputer
A/D input
*2 Measure voltage here.
X18A
Red
Black
White
Low pressure sensor
(V2809)
GND