Daikin FCQ18PVJU Service Manual page 110

Troubleshooting by Indication on the Remote Controller
Troubleshooting
103
Be sure to turn off the power switch before connecting or disconnecting
Caution
the connector, or parts could be damaged.
Check for the points shown below.
Is the stop valve open?
Is the HPS connector properly connected to the
main P.C.B.?
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 Checker.
· Reset the operation using the remote controller,
and then restart the operation.
Does the stop
E3
due to malfunction ( )
recur?
NO
Are the
characteristics of the high
pressure sensor normal?
(See *1.)
YES
Is the
pressure detected with
the P.C.B. normal?
(See *2.)
YES
· The high pressure sensor is normal, and the pressure detected with the P.C.B. is also normal.
· The high pressure has really become high.
(Refer to P.156)
CHECK 1
*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, take the measurement of voltage at the
connector, and then convert it to pressure according to information on P.168.)
*2: Make a comparison between the high pressure value checked with the Service Checker
and the voltage of the pressure sensor (see *1).
*3: Take measurement of voltage of the pressure sensor.
Micro controller
A/D input
Take measurement of DC
voltage between these wires.
NO
Is the HPS
YES
operating value normal
(i.e., 580psi)?
YES
NO
NO
+5V
Connector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
SiUS28-902_a
Rectify defective points, if any.
NO
Replace the HPS.
Replace the high pressure sensor.
Replace the main P.C.B..
Red
High
Black
pressure
sensor
White
Troubleshooting