SiUS281117
Troubleshooting by Remote Controller
150
Service Diagnosis
Troubleshooting
1: Voltage measurement point
The low
pressure sensor
is connected to X18A of
outdoor unit PCB
(A1P).
The
relationship
between the VL
and low pressure is
normal (see
∗
1) when voltage
is measured between X18A
pins (2) and (3) of
outdoor unit PCB
(A1P)
Be sure to turn off the power switch before connecting or disconnecting
connectors, or parts may be damaged.
Caution
Replace the low pressure sensor.
Connect the low pressure sensor
property and turn ON again.
Replace the outdoor unit PCB
(A1P).
NO
YES
YES
NO
Outdoor unit PCB A1P
GND
Micro-computer
A/D input
Red
Black
White
Low pressure sensor
Measure DC voltage here.
+5V
X18A
CHECK 6
CHECK 6
