Question about Ruud Central System Air Conditioner

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Furnace ignites properly but blower does not come on. The lower blower compartment door has a switch on it when you take the door off the blower starts and runs but its not doing that now. The blower works because I can turn thermostat to on and it comes on it just doesnt come on after the burners have ignited when Ive switch it to auto

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  • bessfletchal Oct 06, 2010

    Where is the relay located and is there a way to test it

  • bessfletchal Oct 06, 2010

    Ok the fan works when I turn the switch on the thermostat to on it comes on. When I turn it to auto it doesnt come on after the burners light. Now when I used to take off the door on the bottom of the furnace the blower would come on even if the furnace wasnt running now it doesnt could it be the switch on that door when I push on the switch I can hear a humming when I let off it stops.

  • bessfletchal Oct 06, 2010

    THE FAN MOTOR IS NOT THE PROBLEM IT WORKS THE FURNACE IGNITES CORRECTLY BUT THE BLOWER DOES NOT COME ON. IF I SET THE THERMOSTAT TO ON IT BLOWS IF I SET IT TO AUTO IT DOESNT

  • bessfletchal Oct 07, 2010

    With the thermostat set to heat and blower to auto the blower doesnt come on after the burners ignite. However if I have it set to ac and the blower set to auto it comes on when the ac comes on. So Iam thinking it has to be something to do with what ever tells the blower to come on after the burners have ignited.

  • Rusty Entrekin Dec 23, 2012

    It may be a stuck fan limit control switch spring. Remove it's cover and rotate the dial back and forth to loosen the spring.

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Can you switch it to heat and still get the same result? It sounds like the actual main controller me be to blame here.

Let me know,
Thanks
TIm

Posted on Oct 06, 2010

  • Tim Grayson
    Tim Grayson Oct 07, 2010

    It is the same mechanism that tells the fan to come on with AC as it does with HEAT.... so the mechanism must be malfunctioning. It is the control unit of the furnace, and it sounds like it needs to be replaced.

    Thanks
    Tim

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Be sure the fan on the thremostat is set to auto for the fan to come on, if that does not work force it to manual if it does not work then you have a problem with relay for the fan.

Posted on Oct 06, 2010

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This is possible, however it is possible they are missing something simple. I hope you can follow along.
1) Is this a Sealed Combustion Furnace, meaning you cannot get to the burners even after you remove the Door Panels?

2) If yes, is this furnace vented with pvc/plastic piping?
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5) If you feel comfortable or know of someone that is.
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If you could, send me some information about how it starts up
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