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Furnace making clicking sound when off

Chris
last month

Hi,

I couldn’t find this anywhere else. I was in my garage doing errands and I heard this ticking sound from my furnace. Wouldn’t have noticed it otherwise. It took me a while to figure out that it is probably the pilot light trying to light? I haven’t touched my thermostat or furnace in over a year. I tested the thermostat by turning on the heat and that ticking noise which was at 10 second intervals turns into a rapid fire ticking. I think it’s probably time to replace it since it’s over 20 years old. But how come it’s making that ticking noise when it’s not even on or been used in over a year? Any help? Thanks.

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