According to the operation manual your system is low on refrigerant. You will need a technician show up and charge your unit and find the leak. This is a split system so leaks are very prominent.
"U0" Low pressure drop due to refrigerant shortage or
electronic expansion valve failure
A link to the system manual is below.
Hope this helps you with your issues...Jim...please leave a comment
http://www.daikinac.com/commercial/pdf/service_manual/SkyAir_SiUS25-501.pdf
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