Daikin VRVIII-S, Service Manual

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Troubleshooting by Indication on the remote control SiENBE34-703
156 Troubleshooting
3.29 “
JC
” Outdoor Unit: Malfunction of Low Pressure Sensor
remote control
Display
JC
Applicable
Models RXYSQ4~6P
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 PC board.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to “Pressure Sensor”, pressure/voltage characteristics table on P227.
(V2808)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
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).
Replace the low pressure sensor.
Connect low pressure sensor
property and restart system.
Replace outdoor unit PC board
(A1P).
The low pressure
sensor is connected to
X18A (blue) of outdoor
unit PC board (A1P).
NO
NO
YES
YES
4
3
2
1
(V2809)
Microcomputer
A/D input
Red
Black
White
GND
*2 Measure DC voltage here.
Lo
w pressure sensor
Outside unit PC board A2P
+5V
X45A