Daikin VRVIII-S, Service Manual

Page: 153 / 266

Troubleshooting by Indication on the remote control SiENBE34-703
142 Troubleshooting
Troubleshooting
NO
YES
NO
YES
NO
YES
CHECK 2
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 control, 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 PCB.
· 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.194, 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 P.225.)
*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.
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Is the stop
valve open?
+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