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Troubleshooting by Indication on the Remote Controller
SiUS28-902_B
124
Service Diagnosis
Troubleshooting
1: Voltage measurement point
Refer to “Pressure Sensor, Pressure / Voltage Characteristics” table on P.163.
The high
press
u
re sensor is
connected to X17A of
o
u
tdoor
u
nit PCB
(A1P).
The
relationship
b
et
w
een the
V
H
and high press
u
re is
normal (see
*
1)
w
hen
v
oltage is meas
u
red
b
et
w
een X17A pins (1)
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 high press
u
re sensor.
Replace the o
u
tdoor
u
nit PCB
(A1P).
N
O
YES
YES
N
O
Outdoor unit PCB A1P
Micro-computer
A/D input
GND
Measure DC voltage here.
Red
Black
White
High pressure sensor