Daikin SkyAir RZR-TA Series Service Manual page 235

Be sure to turn off the power switch before connecting or disconnecting
Caution
connectors, or parts may be damaged.
Check the mounting condition of
the outdoor air temperature
thermistor, heat exchanger
deicer thermistor and liquid pipe
thermistor in the piping.
Are the above
thermistor installed on
pipes correctly?
YES
Remove the outdoor air
temperature thermistor, heat
exchanger deicer thermistor and
the liquid pipe thermistor from the
outdoor unit PCB and measure
resistance with a multimeter.
Is the characteristic
of the above
thermistor normal?
CHECK 11
YES
NO
NO
Install the thermistor correctly.
Replace the thermistor.
Rectify the overcharge of the
refrigerant.