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Hello, I need to replace my furnace control board #HH84AA015. I found the replacement part fairly quickly. Also found a bad transformer,#HTO1BC115 (primary winding indicates 'open' with ohm meter, applied 120vac to primary and found no secondary voltage present ). What, in your estimation, could cause this transformer to burn out? Could this cause damage to the control board? Any help would be greatly appreciated. The connector/plug is also showing signs of damage, but I need help locating it.

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Hello,The transformer (breaks) if the secondary is shorted for any reason.Also a power surge to the house/building will kill it (lighting strike/car hitting telephone pole).It might cause damage to the board.It is cheaper to try a new transformer BUT add a inline 3 amp fuse in the secondary so that will be the last transformer you have to replace(just fuses)if the short is hard to find.Power up the old board & see if it works,unless there is obvious damage.The plug sometimes comes with a new board because there is a wiring change to install it(on some) replacement boards.

Posted on Oct 07, 2010

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