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Coleman 7900 gas furnace/central ac, was working fine, now blower wont come on, it tries but turns real slow then stops, i took it out and bench tested the motor andit works fine, put it back in the furnace it wont work. What do i need to replace??????

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  • garycomp Jun 30, 2008

    not intermittent, but put a new capacitor on it, still wont run on ac mode or when i turn thremostat fan switch to on. works ok on heat mode.

  • Anonymous Mar 22, 2014

    I have a eb17b furnace / AC unit. When the heating element is heating up the blower is not coming on. I hear a humming noise, and I shut off breaker then turn it back on it usually starts, but now it will not even click in. What needs replaced?

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Motor run capacitor. If problem is intermittent, try wiggling wires from motor to capacitor to check for broken wires. Motor might seem to work ok with no load on bench but it has no real power. The power to really spin the motor under load comes from the capacitor

Posted on Jun 30, 2008

  • Chris Lyon
    Chris Lyon Jul 01, 2008

    Check the fan relay. The relay turns the fan on when you use the fan switch or in a/c mode but it does not control the heating mode. Also it could be the motor as heating and cooling are two separate windings. The high speed winding in the motor could be bad.

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