Daikin R71FUV1 Service Manual page 41

Si20-701_B
Troubleshooting
Caution
· Indoor unit fan runs at setting airflow rate.
· (In cooling)
When suction air temperature is higher than set
temperature
· (In heating)
When suction air temperature is lower than set
temperature
Is the
power switch
OFF or the fuse for
power switch
blown?
NO
Is the
heating switch
turned ON at outdoor
air temperature >
32˚C
NO
(1)
Is rated
voltage applied at
the compressor
terminals?
NO
(2)
Is rated
voltage output
from the magnetic
switch or power
transistor?
NO
(3)
Is rated
voltage output from
the PCB?
NO
34
Be sure to turn off the power switch before
connecting or disconnecting connectors, or parts
may be damaged.
YES
YES
YES
YES
YES
Symptom-based Troubleshooting
Turn ON the
power switch or
replace the fuse.
Normal.
(Thermostat OFF
by outdoor air
temperature)
Replace the
compressor.
Replace the
magnetic switch
or power
transistor.
Replace the
PCB.
Check the
thermistor.