NO
YES
NO
YES
NO
YES
CHECK 2
Is the stop
valve open?
Open the stop valve.
1 Mount a pressure gauge on the low-pressure service port.
2 Connect the Service Checker.
3 Reset the operation using the remote controller, and then
restart the operation.
Are the
characteristics of the
low pressure sensor
normal?
(See *1.)
Replace the low pressure sensor.
Is the
pressure detected
with the PC board
normal?
(See *2.)
Replace the main PC board.
· The low pressure sensor is normal, and the pressure
detected with the PC board is also normal.
· The low pressure has really become low.
Refer to information on P.224, remove the
causes by which the low pressure has become low.
*1: Make a comparison between the voltage of the pressure sensor (*4) 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 “Pressure Sensor”.)
*2: Make a comparison between the low pressure value checked with the Service Checker and the
voltage of the pressure sensor (see *1).
*3: Make measurement of voltage of the pressure sensor.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
+5V
(4)
(3)
(2)
(1)
Connector for low pressure sensor
Micro controller
A/D input
Make measurement of DC voltage between these wires. (*4)
(Blue)
Red
Black
White
Low
pressure
sensor
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