Daikin ERQ Service Manual page 193

ESIE09-05
Troubleshooting
Micro controller
Troubleshooting
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 PC board?
3 Does the high pressure switch have continuity?
Are the
NO
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 controller,
and then restart the operation.
Does the stop
YES
due to malfunction (E3)
recur?
NO
Are the
NO
characteristics of the high
pressure sensor normal?
(See *1.)
YES
Is the
pressure detected with NO
the PC board normal?
(See *2.)
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.
Refer to information on P.223, remove the causes by
CHECK 1
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 "Pressure Sensor".)
*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.
A/D input
Make measurement of DC voltage between these wires. (*4)
Troubleshooting by Indication on the Remote Controller
Rectify defective points, if any.
Is the HPS
NO
operating value normal
Replace the HPS.
(i.e., 4.0MPa)?
YES
Replace the high pressure sensor.
Replace the main PC board.
+5V
Connector for high
pressure sensor (Red)
(4)
Red
(3) Black
(2)
White
(1)
: http://splitoff.ru/tehn-doc.html
High
pressure
sensor
183