We have the replacement sequencer you need to repair your HVAC system. The sequencer allows a device to use a portion of its electrical power in segments so that one part of the device can turn off while others remain on. This function allows the device to run continuously without overheating certain parts. The sequencer will eventually wear out and need to be replaced. We stock replacement parts made for devices by Arcoair, Comfortmaker, Tempstar, Klixon, Goodman, Janitrol, White Rodgers, York, Mars, Packard, and more.