SiEN18-622 Troubleshooting for Outdoor Unit
Troubleshooting 361
Troubleshooting
Check No.01
Refer to P.404
NO
YES
YES
YES
NO
NO
YES
NO
YES
NO
+5V
(4)
(3)
(2)
(1)
Red
White
Check for the pointsshown below.
1 Is the stop valve open?
2 Is the HPS connector properly connected to the
main PCB?
3 Does the high pressure switch have continuity?
Are the
three points
above OK?
·
Mount a pressure gauge on the high-pressure service port.
· Connect the Service Checker.
· Reset the operation using the remote control,
and then restart the operation.
Does the stop
due to malfunction (E3)
recur?
Is the HPS
operating value normal
(i.e., 4.0MPa)?
Are the
characteristics of the high
pressure sensor normal?
(See *1.)
Is the
pressure detected with
the PCB normal?
(See *2.)
Replace the HPS.
Rectify defective points, if any.
Replace the high pressure sensor.
Replace the main PCB.
· The high pressure sensor is normal, and the pressure detected with the PCB isalso normal.
· The high pressure has really become high.
Check No.01
Referring to information on page 404, remove the causesby
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 409.)
*2: Make a comparison between the high pressure value checked with the Service Checker
and the voltage of the pressure sensor (see *1).
*3: Make me
asurement of voltage of the pressure sensor.
Connector for high
pressure sensor (Red)
Micro controller
A/D input
Make measurement of DC
voltage between these wires.
High
pressure
sensor
Black
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
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