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Sat, 02 Aug 2008
Home Maintenance Project: Furnace Circuit Board Replacement
Our furnace is a Trane, model XL80. The board itself isn't made by Trane, but by White Rogers. The original White Rogers part number on the board is 50M61-495 (the Trane part number is CNT-3077). This board has been replaced by a new improved model (hopefully)... White Rogers model number 50M61-843. I found a replacement board at a couple of web sites, but eventually decided to place an order from part-s-mart.com. Only $108 + $11 expedited shipping. I swapped the board out myself. I figured that the task could not be too much harder than swapping out a motherboard on a desktop computer, a task I've done more times than I can count. In fact, it was quite easy. The boards are laid out identically, so it was just a simple matter of removing wire X from connection Y on fried circuit board and putting it in connection Y on the new circuit board. After about 15 minutes, it was done! Here are a couple pictures of the fried circuit board and the newly installed board (click to enlarge):
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