Malfunction Of Low Pressure Sensor - Daikin Super Multi Plus D-Series Service Manual

SiEBE18-526

7.14 Malfunction of Low Pressure Sensor

JC
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of Malfunction is detected from pressure detected by low pressure sensor.
Malfunction
Detection
Malfunction
When the low pressure sensor is short circuit or open circuit.
Decision
Conditions
Supposed
Causes
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to pressure sensor, pressure/voltage characteristics table on P328.
Troubleshooting
Defect of low pressure sensor
Connection of high pressure sensor with wrong connection.
Defect of outdoor unit PCB.
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The low
pressure sensor is
connected to X45A (blue)
of outdoor unit PCB
(A1P).
YES
The
relationship
between the ∗1
VL and low pressure is
normal (see ∗2) when voltage
is measured between X45A pins
(2) and (3) of outdoor unit
PCB (A1P)
(see ∗1).
NO
Outdoor unit PCB A1P
Microcomputer
A/D input
NO
YES
+5V
GND
*2 Measure voltage here.
Troubleshooting for Outdoor Unit
Connect low pressure sensor
property and restart system.
Replace outdoor unit PCB A1P.
Replace the low pressure sensor.
X45A
4 Red
3 Black
2
White
1
(Q0435)
(Q0434)
307