Daikin VRVIII-S Service Manual page 151

Troubleshooting by Indication on the remote control
Troubleshooting
140
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
Check for the points shown 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?
YES
· 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?
NO
Are the
characteristics of the
high pressure sensor
normal?
(See *1.)
YES
Is the pressure
detected with the PCB
normal? (See *2.)
YES
· The high pressure sensor is normal, and the pressure detected with the PCB is also normal.
· The high pressure has really become high.
Refer to information on P.193, remove the causes by which
CHECK 1
the high pressure has become high.
*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 high 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.
Micro controller
A/D input
Make measurement of DC voltage between these wires. (*4)
NO
Is the HPS
YES
operating value
normal (i.e.,
4.0MPa)?
YES
NO
NO
+5V
Connector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
SiENBE34-703
Rectify defective points, if any.
NO
Replace the HPS.
Replace the high pressure sensor.
Replace the main PCB.
Red
High
Black
pressure
sensor
White
Troubleshooting