Daikin ALTHERMA HT Service Manual page 160

Troubleshooting by Indication on the Remote Controller
Troubleshooting
Check No.1
148
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
Caution
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.
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 209.
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)
ESIE09-08B
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
Troubleshooting