Daikin R30NUV1 - 3.31 E4 Low Pressure System Abnormality

Si20-701_B Troubleshooting by Remote Controller
166
Refer to P.468.
Refer to P.470.
Is the
pressure sensor
properly connected to
the outdoor unit
PCB?
NO YES
YES
YES
YES
YES
NO
Remove the
thermistor from the
indoor unit PCB and
measure the
resistance.
Is it normal?
NO
Connect the
connector
properly.
Replace the
group
thermistor.
Replace the
pressure
sensor.
NO
Replace the
indoor unit
intermediate
thermistor.
Remove the thermistor
from the outdoor unit PCB
and measure resistance.
Is it normal?
CHECK 6
CHECK 7
Measure
voltage between
the connector pins
(1) and (3) of the
connector.
Is the relation
between low
pressure and
voltage
normal?
RZQG
except RZQG
CHECK 3
A
B
C
CHECK 6
CHECK 7