Specifications

Troubleshooting for Outdoor Unit SiBE18-821
330 Troubleshooting
Troubleshooting
∗
2: Voltage measurement point
∗
1: Refer to “Thermistor Resistance / Temperature Characteristics” table on P349.
∗
2: Refer to “Pressure Sensor, Pressure / Voltage Characteristics” table on P351.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Cooling
Is the low
pressure sensor
correct?
Low pressure is
0.25 MPa or less.
The
voltage
of X18A pins
(2) and (3) on main
outdoor unit PC board
(A1P) is 1.0 VDC or less.
(Low pressure
sensor output
voltage)
∗2
The suction
pipe1 temp. minus
low pressure saturation
temp. is 20 ˚C or
higher.
Resistance
is normal when
measured with the
thermistor (R3T) for suction
pipe1 disconnected from
the outdoor unit PC
board.
∗1
Out of gas, closing of stop
valve or refrigerant system
is clogged. Requires
check of refrigerant
system.
Replace the outdoor unit
PC board (A1P).
(Q0575)
YES YES
Replace main outdoor unit
PC board (A1P).
YES
Out of gas or refrigerant
system is clogged.
Requires check of
refrigerant system.
YES
Replace the thermistor.
NO
Replace the low pressure
sensor.
NO
NONO
NO
YES
YES
Replace low pressure
sensor.
NO