Daikin RXYQ96PYDN Service Manual page 375

Troubleshooting by Indication on the Remote Controller
Troubleshooting
360
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.
Is the stop valve open?
Is the HPS connector properly connected to the
main PC board?
Does the high pressure switch have continuity?
Are the
three points above
OK?
YES
Mount a pressure gauge on the high-pressure
service port.
Reset the operation using the remote controller,
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
Service Checker
Connect the service checker to compare the "high pressure" value and the
actual measurement value by pressure sensor (Refer to ∗1) by using the
service checker.
Check if the
"high pressure" value and
the actual measurement value by
pressure sensor are
the same.
YES
· The high pressure sensor is normal, and the pressure detected with the PC board is also normal.
· The high pressure has really become high.
Referring to information on P464, remove the causes by
CHECK 5
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 P533.)
∗2: Make measurement of voltage of the pressure sensor.
Micro controller
A/D input
Make measurement of DC
voltage between these wires.
NO
Is the HPS
YES
operating value normal
(i.e., 580psi)?
YES
NO
NO
+5V
Connector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
SiUS34-801A_b
Rectify defective points, if any.
NO
Replace the HPS.
Replace the high pressure sensor.
Replace main PC board ( A1P).
Red
High
Black
pressure
sensor
White
Troubleshooting