Daikin ERSQ 011AAV1 Service Manual page 157

ESIE09-08
Troubleshooting
Check No.1
Troubleshooting
Be sure to turn off power switch before connecting or disconnecting connector,
Caution otherwise parts may be damaged.
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 three
points above OK?
YES
Mount a pressure gauge on the high-pressure service port.
Connect the Service Tool.
Reset the operation using the remote control,
put power off for ~ 10 seconds and then restart the operation.
Does the stop
due to malfunction (E3-01)
recur?
NO
Are the
characteristics of the
high pressure sensor
normal? (See
*1.)
YES
Is the
pressure detected with
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.
CHECK 1 Refer to "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.)
*2: Make a comparison between the high pressure value checked with the Service Tool.
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)
: Refer to information on page 206.
Troubleshooting by Indication on the Remote Controller
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)
Rectify defective points, if any.
NO
Replace the HPS.
Replace the high pressure sensor.
Replace the main PC board.
Red
High
Black
pressure
sensor
White
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