Daikin R71FUV1 Service Manual page 363

Si20-701_B
Remote Controller Display
U0
Applicable Models
RZR71KUV1, RZQG
Method of Error Detection
(In cooling operation)
Detection based on difference in temperature between
temperature preset by remote controller and suction air
temperature, electronic expansion valve opening degree,
compressor frequency and low pressure.
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.]
Supposed Causes
Refrigerant shortage
Clogged refrigerant piping system
Mismatching of wiring and piping
356
Troubleshooting by Remote Controller