Jc" Outdoor Unit: Malfunction Of Low Pressure Sensor - Daikin VRVIII-S Service Manual

Troubleshooting by Indication on the remote control

3.29 "JC" Outdoor Unit: Malfunction of Low Pressure Sensor

JC
remote control
Display
Applicable
RXYSQ4~6P
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
! Defect of low pressure sensor
Causes ! 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 P227.
156
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
The low pressure
NO
sensor is connected to
X18A (blue) of outdoor
unit PC board (A1P).
YES
The relationship
between the *1 VL and
low pressure is normal
YES
(see *2) when voltage is
measured between
X18A pins (2) and (3) of
outdoor unit PC board
(A1P)
(see *1).
NO
Outside unit PC board A2P
GND
Microcomputer
A/D input
*2 Measure DC voltage here.
Connect low pressure sensor
property and restart system.
Replace outdoor unit PC board
(A1P).
Replace the low pressure sensor.
+5V
X45A
Red
4
3 Black
White
2
1
SiENBE34-703
(V2808)
(V2809)
Troubleshooting