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    johnny11's Avatar
    johnny11 Posts: 1, Reputation: 1
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    #1

    Sep 17, 2005, 07:20 PM
    Lennox home ac
    My central heat and air is making a loud rumble when turned on. It is the inside unit, not outside the house. The lights flashing say the limit control may be open when these lights are flashing, but I am not sure what that is.
    I think it is the bearings, but am unable to oil, and am not very mechanical.
    Can someone tell me if a shot of WD-40 may solve this, or do I need a service call... sweating in Texas...
    labman's Avatar
    labman Posts: 10,580, Reputation: 551
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    #2

    Sep 17, 2005, 08:20 PM
    The limit switch is part of the controls for the blower and fuel. It should not directly cause any noise. A shot of WD-40 into the bearing of the blower motor might stop the noise temporarily, at least through the weekend, until you can get a service man.
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