SiBE18-821_C
Troubleshooting for Outdoor Unit
Troubleshooting
385
Troubleshooting
Check No.01
Refer to P.423
Check No.01
NO
YES
YES
YES
NO
NO
YES
NO
Check for the points shown below.
(1) Is the stop valve open?
(2) Is the high pressure switch connector properly
connected to the main PCB (A1P)?
(3) Does the high pressure switch have continuity?
Are the
three points above
OK?
Rectify the defective points.
NO
YES
Check if
the “high pressure”
value and the actual
measurement value by
pressure sensor
are the
same.
Replace the main PCB (A1P).
(1) Mount a pressure gauge on the high pressure
service port.
(2) Reset the operation using the remote
controller, and then restart the operation.
Does the stop
due to malfunction (E3)
recur?
Is the
high pressure switch
operating value normal
(4.0 MPa)?
Are the
characteristics of the
high pressure sensor
normal?
(See
∗
1.)
Replace the high pressure switch.
Replace the high pressure sensor.
· The high pressure sensor is normal, and the pressure detected with the PCB is also normal.
· The high pressure has really become high.
Remove the causes by which the high pressure has become high.
∗
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.
+5V
GND
(4)
(3)
(2)
(1)
X17A (Red)
High
pressure
sensor
Microcomputer
A/D input
Measure the voltage here.
Red
Black
White
Service Checker
Connect the service checker to compare the “high pressure” value and the
actual measurement value by pressure sensor (Refer to
∗
1) by using the
service checker.
(R13017)
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
