Daikin E-Series Service Manual page 372

SiAU18-715
Troubleshooting
Check No.01
Refer to P.402
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.
Is the stop valve open?
Is the HPS connector properly connected to the
main PCB?
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 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
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.
Check No.01 Referring to information on page 402, remove the causes by 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 page 407.)
*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.
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)
Troubleshooting for Outdoor Unit
Rectify defective points, if any.
NO
Replace the HPS.
Replace the high pressure sensor.
Replace the main PCB.
Red
High
Black
pressure
sensor
White
(Q0551)
359