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At 20 years old, if you can afford it, the best thing is to replace the furnace rather than spend 300 to 400 bucks on this one.You will have a new 10 year parts warranty and 20 year heat exchanger warranty.
If you have further questions, please let me know.
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AS for the control board,they are readily available. if you can give me full model off the label in burner compartment I will tell you what control board you need and help you locate if you want to do yourself.