Daikin VRVIII-S, Service Manual

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