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    ahhhhhh.'s Avatar
    ahhhhhh. Posts: 4, Reputation: 1
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    #1

    Oct 20, 2011, 08:56 AM
    Circuit board smoking
    Hello. I woke up this morning and noticed my indoor blower is running even though its off (no ac/heat/fan auto). I cut the power and opened the air handler up to do a quick inspection and didn't see anything wrong. I cut the power back on and while the blower didn't come on, the circuit board started to smoke. It's a fairly simple unit (so I thought) with little wires in it, so I disconnected everything except for the main plug going to the board. Turn the power back on and it starts to smoke again. Now I'm thinking there must be a short. I couldn't find anything upon visually inspecting it, so what would be some good tests to run?
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #2

    Oct 20, 2011, 08:59 AM
    Replace
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #3

    Oct 20, 2011, 09:00 AM
    Your furnace should know,, smoking is bad
    ahhhhhh.'s Avatar
    ahhhhhh. Posts: 4, Reputation: 1
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    #4

    Oct 20, 2011, 09:04 AM
    Replacing my furnace seems a little extreme.
    wmproop's Avatar
    wmproop Posts: 3,749, Reputation: 91
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    #5

    Oct 20, 2011, 09:14 AM
    The circuit board,, is that not what you said was smoking?
    ahhhhhh.'s Avatar
    ahhhhhh. Posts: 4, Reputation: 1
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    #6

    Oct 20, 2011, 09:19 AM
    Yea sorry wasn't 100% sure what you meant. I have a spare board that I quickly tried out. Although it isn't brand new, it was taken off another unit I had a while back. This one started to smoke and actually left a burnt mark on it. Unfortunately I didn't cut it off in time.
    ahhhhhh.'s Avatar
    ahhhhhh. Posts: 4, Reputation: 1
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    #7

    Oct 20, 2011, 09:20 AM
    I was hoping of doing some tests with my multimeter but, I just need to know what I should check for.
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