Daikin ALTHERMA HT EKBUHAA6 V3, Service Manual

Page: 175 / 302

ESIE09-08A Troubleshooting by Indication on the Remote Controller
Troubleshooting 165
:

Refer to information on page 219.
NO
YES
NO
YES
NO
YES
CHECK 2
Is the
stop valve
open?
Open the stop valve.

Mount a pressure gauge on the low-pressure service port.
 Connect the Service Tool.

Reset the operation using the remote control, and then restart
the operation.
Are the
characteristics of
the low pressure sensor
normal? (See
*1.)
Replace the low pressure sensor.
Is the
pressure
detected with the PC
board normal?
(See *2.)
Replace the control PC board (A4P). .
·
The low pressure sensor is normal, and the pressure
detected with the PC board is also normal.
·
The low pressure has really become low.
Refer to “remove the causes by which the low
pressure has become low”.
*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 low 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.
Caution
Be sure to turn off power switch before connecting or disconnecting
connector, otherwise parts may be damaged.
+5V
(4)
(3)
(2)
(1)
Connector for low pressure sensor
Micro controller
A/D input
Make measurement of DC voltage between these wires. (*4)
(Blue)
Red
Black
White
Low
pressure
sensor
Check No.2