Abstract: An electronic control (8) is shown adapted for use with gas furnaces which controls function and speed(s) of an induced draft motor (44), an igniter source (13), gas valve(s) (14), and function and speed(s) of a blower motor (21) based on inputs from a room thermostat, various sensor and safety devices, and proper sequence/position/change of position timing of these inputs. The control is capable of detecting and saving for recall specific errors and faults that occur while in service. The control can communicate warnings, faults, and errors, as well as safety lock-out conditions in various ways including a Light Emitting Diode (LED) (9), as a generic fault condition through a set of dry contacts (45a), or as very specific fault conditions through a communications interface (H4). The control provides other benefits to the installer, occupants of the space, and service technicians including selectable igniter warm-up times, user selectable fan On speed and blower delay-off times.