Daikin R71FUV1 Service Manual page 357

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