Elgin Air conditioning repair Upon my arrival, customer was concerned that nothing was coming on. During my diagnosis, I found the auxiliary drain pan to be full of water as well as the water removal System pump to be clogged. presented customer with options for repair. Customer chose the HF3B option. Flushed and treated water removal system added bio protect and pan tablets to water removal system and auxiliary drain pan. Added bio protect to water removal pump pan. tested system for performance and safety. system operating to manufacturer specifications at this time.