Daikin R71FUV1 Service Manual page 361

Si20-701_B
Remote Controller Display
U0
Applicable Models
RZQ(S)-C
Method of Error Detection
(In cooling operation)
Detection based on difference in temperature between
temperature preset by remote controller and indoor
suction air temperature, electronic expansion valve
opening degree, compressor frequency and low
pressure.
(In heating operation)
Detection based on difference in temperature between
temperature preset by remote controller and indoor
suction air temperature, electronic expansion valve
opening degree during the control of suction air
superheating, high pressure, indoor heat exchanger
temperature and indoor suction air temperature.
Error Decision Conditions
(In cooling operation)
When compressor frequency does not increase even
though the load is heavy because the electronic
expansion valve is opened to the fullest extent
[If low pressure drops when the compressor is at 41Hz,
error is confirmed.]
(In heating operation)
When suction gas superheated degree is large,
compressor frequency is low and the electronic
expansion valve is opened to the fullest extent even
though heating load is heavy
[If high pressure is lower than saturated pressure for
indoor heat exchanger temperature (or indoor suction air
temperature), error is confirmed.]
354
Troubleshooting by Remote Controller