Daikin Altherma HT - Page 165

ESIE09-08B Troubleshooting by Indication on the Remote Controller
Troubleshooting 153
Troubleshooting
:  Refer to information on page 210.
Caution
Be sure to turn off power switch before connect or disconnect
connector, or parts damage may be occured.
NO
YE S
NO
YE S
NO
YE S
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? (Se e
*1.)
Is the
pressure
detected with the PC
board normal?
(See *2.)
· 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
and then convert it to pressure.)
*2: Make a comparison between the low pressure value checked with the Ser vice Tool
and the voltage of the pressure sensor (see *1).
*3: Make measurement of voltage of the pressure sensor.
+5V
(4)
(3)
(2)
(1)
Connector for low pressure sensor
Micro controller
A/D input
(Blue)
Re d
Black
Whi t e
Low
pressure
sensor
Replace the low pressure sensor.
Replace the main PC board.
Make measurement of DC voltage between these wires. (*4)
Check No.2