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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
When this clicks and the fan motor won't come on it is usually a sign that the control board fan relay is bad or when it does this on and off again, it can be a bad solder joint on the board. These OEM boards are not good quality and made in China. I have seen some in my own shop that won't last more than a few months. You can have it tested, but if you don't have an outside inspection panel over the furnace, the furnace will need to be pulled in order to access it. Most shops can test these for you, but even then, the test isn't always conclusive. I would go ahead and spend the money for a good after market board made by Dinosaur Electronics in Oregon. Much superior to the OEM boards and they have a 3 year warranty should you ever need it. Hope that proves helpful here. Please get back to me if you need more later as all follow ups are included in our fee.
The board part number you would need is called a "Fan 50 Plus" board and online you can find them numerous places. Shop around as the price varies. If you are handy with tools, this isn't that hard to do and I can direct you in that and furnish a manual. I will also make a phone chat option offer for you as some customers prefer that personal touch.
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