Daikin RTSQ20PY1 Service Manual page 256

Troubleshooting by Indication on the Remote Controller
Troubleshooting
245
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
While in monitor mode,
check the outdoor unit and
the function unit concerned.
Check for the points shown below.
(1) Is the stop valve open?
(2) Is the high pressure switch connector properly
connected to the main PCB?
(3) Does the high pressure switch have continuity?
Are the three
points above
OK?
YES
(1) Mount a pressure gauge on the high-pressure service port.
(2) 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
Service Checker
Connect the service checker to compare the "high pressure" value and the actual
measurement value by pressure sensor (Refer to *1) by using the service checker.
Check if the "high
pressure" value and the
actual measurement value
by pressure sensor are the
same.
YES
· The high pressure sensor is normal, and the pressure detected with the PCB is also normal.
· The high pressure has really become high.
Referring to information on P.342, remove the causes by which
CHECK 5
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 P.410.)
*2: Make measurement of voltage of the pressure sensor.
Micro-controller
A/D input
Make measurement of DC
voltage between these wires.
NO
YES
Is the high pressure switch
operating value normal
(i.e., 4.0MPa)?
YES
NO
NO
+5V
Connector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
SiBE31-801_C
Rectify the defective points, if
any.
NO
Replace the high pressure switch.
Replace the high pressure sensor.
Replace the main PCB (A1P).
Red
High
Black
pressure
sensor
White
Troubleshooting