Daikin VRVIII-S, Service Manual

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SiENBE34-703 Troubleshooting by Indication on the remote control
Troubleshooting 155
3.28 “
JA
” Outdoor Unit: Malfunction of High Pressure Sensor
remote control
Display
JA
Applicable
Models RXYSQ4~6P
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 PC board.
Troubleshooting
∗
1: Voltage measurement point
∗
2: Refer to “Pressure Sensor”, pressure / voltage characteristics table on P227.
(V2806)
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
The
relationship
between the
∗
1
VH and high pressure is
normal (see
∗
2) when voltage
is measured between X17A
pins (1) and (3) of outdoor
unit PC board (A1P)
(see
∗
1).
Replace the high pressure sensor.
Connect the high pressure sensor
and turn on again.
Replace outdoor unit PC board
(A1P).
The high pressure
sensor is connected to
X17A of outdoor unit
PC board
(A1P).
NO
NO
YES
YES
Outside unit PC board A2P
+5V
X46A
Red
Black
White
GND
*2 Measure DC voltage here.
Lo
w pressure sensor
Microcomputer
A/D input
4
3
2
1
(V2807)