On arrival, I found the emergency water safety switch tripped due to a restriction inside the primary drain line. Removed power from system, blew out the primary drain line and flushed drain line out. Verified drain had proper flow of water and then treated the primary drain line with a drain treatment. Opened up the indoor air handler and cleaned out the primary drain pan and treated with a drain treatment inside the drain pan. Reset the cooling system and inspected all Performance, Mechanical and Safety Systems. Verified everything was operating within manufacture’s specifications for operation. Everything is working at this time.