Daikin ERSQ 011AAV1, Service Manual

Page: 183 / 262

ESIE09-08 Troubleshooting by Indication on the Remote Controller
Troubleshooting 171
3.32
“JA”
Outdoor Unit: Malfunction of High Pressure Sensor
Remote Control
Display
JA
Applicable
Models ER*Q 011~016*
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 P232.
(V2806)
Caution
Be sure to turn off power switch before connecting or disconnecting connector,
otherwise parts may be damaged.
The
relationship
between the *1
VH and high pressure is
normal (see *2) when voltage
is measured between
X17A pins (1) and (3) of
indoor unit PC board
(A1P) (see *1).
Replace the high pressure sensor.
Connect the high pressure sensor
and turn on again.
NO
NO
Replace indoor unit PC board
(A1P).
YES
YES
The high
pressure sensor is
connected to X17A of
indoor unit PC
board (A1P).
Indoor unit PC board A4P
+5V
X17A
Red
Black
White
GND
*2 Measure DC voltage here.
H
igh pr
essur
e sensor
4
3
2
1
(V2807)
Microcomputer
A/D input