Thermostat was defective and unresponsive upon arrival. Condensate line was clogged as well. Float switch was removed and batteries to thermostat were changed to verify thermostat was defective. Still blank screen and not responding to any command. All major and minor electrical components were checked and compressor start up amps were excessive. Indoor unit had biological growth build up. Customer was advised of all these issues and opted for a new thermostat, condensate flush and treatment, as well as a hard start assist. After installation customers system is working.