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Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
126
Service Diagnosis
Troubleshooting
1: Voltage measurement point
Refer to “Pressure Sensor, Pressure / Voltage Characteristics” table on P.163.
The lo
w
press
u
re sensor is
connected to X1
8
A of
o
u
tdoor
u
nit PCB
(A1P).
The
relationship
b
et
w
een the
V
L
and lo
w
press
u
re is
normal (see
*
1)
w
hen
v
oltage
is meas
u
red
b
et
w
een X1
8
A
pins (2) and (3) of
o
u
tdoor
u
nit PCB
(A1P)
Be s
u
re to t
u
rn off the po
w
er s
w
itch
b
efore connecting or disconnecting
the connector or parts may
b
e damaged.
Caution
Replace the lo
w
press
u
re sensor.
Connect the lo
w
press
u
re sensor
property and t
u
rn O
N
again.
Replace the o
u
tdoor
u
nit PCB
(A1P).
N
O
YES
YES
N
O
Outdoor unit PCB A1P
GND
Micro-computer
A/D input
Red
Black
White
Low pressure sensor
Measure DC voltage here.
+5V
X18A