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The furnace you are talking about i believe has what is called a 3 wire pilot, the clickling you are hearing is coming from the from the gas valve because the pilot contacts are not making propery, there is no cleaning of this part and it will need to be replaced. your blower will turn on when a call for heat is present regardless if you have flame or not, blower is controled by timer on circuit board it will turn on automatically after 45-60 sec after call for heat and turn off 90 sec after call for heat ends.
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