On arrival, found the emergency water safety switch tripped due to a restricted drain line. Blew out the primary line and went outside to visually confirm the clog was removed. Flushed out line with multiple gallons of water to remove any loose debris from drain. Opened up the indoor air handler and cleaned out the primary drain pan and removed the drain snot that was inside the pan. Used a drain treatment inside the primary pan and line. Reset the cooling system and inspected all Performance, Mechanical and Safety Systems. Everything is working at this time.