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 Pilot intermittent self igniting full timePilot intermittent (self igniting) full time: Currently manufactured high efficiency fossil fuel burning systems use an electric ignition system which creates a spark to light the gas flow. If a flame is produced, a thermocouple detects the heat and turns off the spark. There is no pilot light in these systems, therefore, no wasted fuel. These units do fail occasionally, but new ones can be purchased as a kite and are easily installed by qualified personnel. Many full time pilot light ignition systems are still in use today. This equipment always utilizes a small flame, or pilot light, which ignites the flow of gas. If the pilot light should blow out, a safety device will, if working properly, not allow gas to pass through. This device is not tested by the inspector. A pilot light uses energy and costs money when it is burning. You may want to shut off the pilot light when the system is not in use for long periods of time, such as seasonally. Turn off the gas valve supplying the unit when you turn off the pilot light. Check the size and color of the flame occasionally. A small blue flame is preferred. Too large a flame will prematurely burn out the thermocouple. Call a heating contractor to adjust any abnormal flame or any other problems with your unit. Heat exchanger crack Setback thermostat Thermostat built-on unit
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