We performed a deep humidifier cleaning, a duct cleaning which included washing all supply and return grills, cleaning all main lines and branches as possible, clean blower compartment, and spraying system with envirocon. Pulled and cleaned blower assembly. We also did a Hot Water Tank Flush to remove sediment from the system. In addition, we replaced a flame sensor. This is part of an electric ignition system that is connected to the gas valve to control the flow of gas to the furnace. A flame sensor can come in both L or straight shapes, and it is part of the furnace burner's basic assembly.