Specifications

SiBE341027 Troubleshooting by Remote Controller
Service Diagnosis 109
Troubleshooting
Note:
*1: Make a comparison between the voltage of the pressure sensor and that read by the
pressure gauge.
(As to the voltage of the pressure sensor, make measurement of voltage at the connector,
and then convert it to pressure.)
*2: Make measurement of voltage of the pressure sensor.
Refer to P.180
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
NO
YES
Open the stop valve.
YES
NO
NO
YES
Replace the low pressure sensor.
Replace the outdoor unit main
PCB (A1P).
Is the stop
valve opened?
(1) Mount a pressure gauge on the low pressure
service port.
(2) Reset the operation using the remote
controller, and then restart the operation.
Are the
characteristics of
the low pressure
sensor normal?
(*1)
Check if the “low
pressure” value and
the actual
measurement value
by pressure sensor
are the same.
· The low pressure sensor is normal, and the pressure
detected with the PCB is also normal.
· The low pressure has really become low.
Remove the causes by which the low pressure has
become low.
Service Checker
Connect the service checker to compare the “low pressure”
value and the actual measurement value by pressure
sensor (*1) by using the service checker.
CHECK 2
+5V
Connector for low pressure sensor
Micro-controller
A/D input
Make measurement of DC voltage between these wires.
Red
Black
White
Low
pressure
sensor
(4)
(3)
(2)
(1)
(Blue)
CHECK 2