SiUS281117
Troubleshooting by Remote Controller
132
Service Diagnosis
Troubleshooting
Note:
1: Make a comparison between the voltage of the pressure sensor and that read by the
pressure gauge.
(Measure the pressure-sensor voltage at the connector (
2), and then convert it to
pressure.
)
2: Measure the voltage of the pressure sensor.
Refer to P.173.
Refer to P.179.
NO
YES
YES
YES
NO
Is the high
pressure switch operating value normal
(i.e., 580 psi)?
NO
YES
Are the
characteristics of the high pressure
sensor normal? (
∗
1)
NO
Are the three points
above OK?
Rectify the defective points,
if any.
NO
YES
Check if the
“high pressure” value and
the actual measurement value by
pressure sensor are the
same.
Replace the outdoor unit main PCB
(A1P).
Mount a pressure gauge on the high pressure
service port.
Reset the operation using the remote controller,
and then restart the operation.
Does the abnormal
stop "
E3
" recur?
Replace the high pressure switch.
Replace the high pressure sensor.
· 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.
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 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?
Caution
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
CHECK 6
+5
V
(4)
(3)
(2)
(1)
Connector for high
press
u
re sensor (Red)
Micro-comp
u
ter
A/D inp
u
t
Meas
u
re the DC
v
oltage
b
et
w
een these
w
ires.
High
press
u
re
sensor
Red
Black
W
hite
CHECK1
CHECK6
