Daikin RZQG71L9V1, Service Manual

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ESIE15-13C Troubleshooting by Remote Controller
Service Diagnosis 169
4.32 Refrigerant Shortage (Error)
Remote
Controller
Display
U0
Applicable
Models
RZQG
Method of Error
Detection
(In cooling)
Detection based on difference in temperature between temperature set by remote controller and
indoor suction air temperature, electronic expansion valve opening degree, compressor
frequency and low pressure.
(In heating)
Detection based on difference in temperature between temperature set 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)
When compressor frequency does not increase even though the load is heavy because the
electronic expansion valve is opened to the fullest extent
(In heating)
When suction gas superheat 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.]
Supposed
Causes
 Refrigerant shortage

Clogged refrigerant piping system

Mismatching of wiring and piping
 Stop valve is not opened