In Scottsdale, near East Sorrel Lane and North 129th Place performing a diagnostic on 2 systems. On arrival, found system not cooling. Compressor was just installed; system low on R410A Freon. Upon further inspection, found high side King valve not fully opened causing leak. Tightened liquid line King valve. Charged with 3.5 pounds of refrigerant. System is under warranty. Found condenser not kicking on; wet switch is tripped. Blew out drain line and system tried to start. Found contactor burnt very badly. System needs new single pole contactor and drain clear out. Performed repairs and system is running properly and within manufacturer specifications.