Si20-701_B
Troubleshooting by Remote Controller
350
Troubleshooting
Refer to P.470.
Cooling
NO
NO
Caution
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
Low
pressure is 0.1
MPa or less.
Refrigerant
shortage, closing
of stop valve or
refrigerant
system is
clogged.
Requires check
of refrigerant
system.
The
voltage
of X31A pins
(2) and (3) on
outdoor unit main PCB
(A1P) is 0.8 VDC or less.
(Low pressure sensor
output voltage)
NO
Replace the
outdoor unit main
PCB (A1P).
Replace the low
pressure sensor.
YES
YES
YES
CHECK 7
A
Difference
between suction
pipe and outdoor unit
heat exchanger
temperature is
20˚C or
higher.
Refrigerant
shortage or
refrigerant
system is
clogged.
Requires check
of refrigerant
YES
NO
CHECK 7
