Does the furnace work with the old module? Or is there a problem with the furnace and the gas company figured it was the board. You say the old module works fine, so I ask the same question as markwithak, why replace. If there is a problem with the operation of the furnace, give us some details(preferably with the old board installed) and one of us may be able to help. And as far as gas companys trying to fix furnaces. They usually don't know what they are doing, they are in the business of selling gas and maintaining gas lines, not trouble shooting complicated pieces of heating equiptment.
Ps. All you gas guys out there, stick to your trade, and make my life a little easier by not working on water heaters, furnaces, or anything beyond the meter. You make enough money on your gas sales, why steal work from plumbers and hvac techs.
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