Daikin SkyAir RZR-P Series Service Manual page 139

SiUS281117
Troubleshooting
1: Make a comparison between the voltage of the pressure sensor and that read by the
Note:
2: Measure the voltage of the pressure sensor.
CHECK1
CHECK6
132
Be sure to turn off the power switch before connecting or disconnecting
Caution connectors, or parts may be damaged.
Check for the points shown below.
Is the stop valve open?
Is the high pressure switch connector properly
connected to the outdoor unit main PCB?
Is these continuity with the high pressure switch?
NO
Are the three points
above OK?
YES
Mount a pressure gauge on the high pressure
service port.
Reset the operation using the remote controller,
and then restart the operation.
YES
Does the abnormal
stop "E3" recur?
NO
Are the
NO
characteristics of the high pressure
sensor normal? (∗1)
YES
Service Checker
Connect the service checker to compare the "high pressure" value
checked with the Service Checker and the actual measurement value by
pressure sensor (∗1).
Check if the
"high pressure" value and
NO
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.
CHECK 1 Remove the causes by which the high pressure has become high.
pressure gauge.
(Measure the pressure-sensor voltage at the connector (2), and then convert it to
pressure. CHECK 6 )
Micro-computer
A/D input
Measure the DC voltage between these wires.
Refer to P.173.
Refer to P.179.
Troubleshooting by Remote Controller
Rectify the defective points,
if any.
Is the high
NO
pressure switch operating value normal Replace the high pressure switch.
(i.e., 580 psi)?
YES
Replace the high pressure sensor.
Replace the outdoor unit main PCB
(A1P).
+5V
Connector for high
pressure sensor (Red)
(4)
(3)
(2)
(1)
Red
High
Black
pressure
sensor
White
Service Diagnosis