Daikin Super Multi Plus E-Series Service Manual page 375

SiEN18-622
Troubleshooting
Check No.02
Refer to P.405
Troubleshooting
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Caution
Is the stop
valve open?
1 Mount a pressure gauge on the low-pressure service port.
2 Connect the Service Checker.
3 Reset the operation using the remote control, and then
restart the operation.
Are the
characteristics of
the low pressure
sensor normal?
(See *1.)
Is the
pressure detected
with the PCB
normal?
(See *2.)
· The low pressure sensor is normal, and the pressure
detected with the PCB is also normal.
· The low pressure has really become low.
Check No.2 Referring to information on page 404, remove the
causes by which the low pressure has become low.
*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 409.)
*2: Make a comparison between the low 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
YES
NO
YES
NO
YES
+5V
Connector for low pressure sensor
(Blue)
(4)
(3)
(2)
(1)
Troubleshooting for Outdoor Unit
Open the stop valve.
Replace the low pressure sensor.
Replace the main PCB.
Red
Black Low
pressure
White sensor
363