SiBE18-821_C Troubleshooting for Outdoor Unit
Troubleshooting 387
Troubleshooting
Check No.02
Refer to P.424
NO
YES
NO
YES
YES
Is the stop valve open?
Open the stop valve.
(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?
(See ∗1.)
Check if
the “low pressure”
value and the actual
measurement value by
pressure sensor
are the
same.
Replace the low pressure sensor.
· 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.
∗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 according to information on page 429.)
∗2: Make measurement of voltage of the pressure sensor.
Replace the main PCB (A1P).
NO
Service Checker
Connect the service checker to compare the “low
pressure” value and the actual measurement value by
pressure sensor (Refer to *1) by using the service checker.
Check No.02
+5V
GND
(4)
(3)
(2)
(1)
Microcomputer
A/D input
Measure the voltage here.
X18A (Blue)
Red
Black
White
Low
pressure
sensor
(R13018)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
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