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Old 02-15-2010, 06:34 PM   #1
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control board?

Trying to figure out if the control board is bad. inducer fan and blower fan run all the time even when i disconnect t wires at board even if i pull the plug harness with wires that go to gas valve,inducer switch and limits.Sounds like a bad board everything else checks out oh my voltage at the w on t stat is only 17v all others are 24?

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Old 02-15-2010, 08:09 PM   #2
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control board?

Is it a ComfortMaker furnace? Many furnaces will energize the blower and inducer motors if you have an open limit. Check for continuity through all the limits before you pull the board.

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