Ja" Outdoor Unit: Malfunction Of High Pressure Sensor - Daikin R-410A Service Manual

Troubleshooting by Indication on the Remote Controller

4.26 "JA" Outdoor Unit: Malfunction of High Pressure Sensor

JA
Remote
Controller
Display
Applicable
AII outdoor unit models
Models
Method of Malfunction is detected from the pressure detected by the high pressure sensor.
Malfunction
Detection
Malfunction
When the high pressure sensor is short circuit or open circuit.
Decision
Conditions
! Defect of high pressure sensor
Supposed
! Connection of low pressure sensor with wrong connection.
Causes
! Defect of outdoor unit PC board.
Troubleshooting
∗1: Voltage measurement point
∗2: Refer to pressure sensor, pressure / voltage characteristics table on P200.
140
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
The high
pressure sensor is
connected to X46A of
outdoor unit PC
board (A1P).
YES
The
relationship
between the ∗1
VH and high pressure
is normal (see ∗2) when
voltage is measured between
X46A pins (1) and (3) of
outdoor unit PC
board (A1P)
(see ∗1).
NO
Outdoor unit PC board A1P
Microcomputer
A/D input
∗2 Measure DC voltage here.
NO
YES
+5V
GND
Connect the high pressure sensor
and turn on again.
Replace outdoor unit PC board
A1P.
Replace the high pressure sensor.
X46A
Red
Black
White
Troubleshooting
SiBE39-402A
(V2806)