Perhaps you have the thermostat set to heat, with the gas off. If this is the case, and the temperature goes below the thermostat setting, the furnace fan will come on and the furnace will try to ignite producing a clicking sound. I know this because I brushed up against the thermostat and inadvertently set the selector to "heat". Later on I heard the fan come on and the furnace try to ignite.
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Stu & Nina Stoner
Central PA
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