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Ruud silhouette II furnace

The blower on my furnace seems to run a long time after the flames go out. Is there a way to shorten how long the blower runs after the flames go out. Right now it feels like it is cooling the rooms as much as heating them.

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Yes. On the board mounted inside the furnace box. There will be a series of posts that have numbers printed below each post. The heat motor uses low speed so it should be a sort of fat (larger than most of the other wires) red wire attached to one of the posts. If the wire is on 60, for example, then move it to the next lower post, like 30. unplug the cord on the furnace first. The wire SHOULD be red but may be blue, don't let the color guide you, look for the place where the wires go. If you find the place I'm talking about and the wire is black, then let me know, because its wired to high speed, which is wrong. I will help you.

Posted on Mar 13, 2008

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I have a Ruud Silhouette 2 The problrm is it will start up the burners come on they go off about 10 seconds later, also when the house reaches stat temp the heater will kick in and of at the same...


Hello, this sounds like a flame sensor issue or high limit switch problem. First, turn off power to the Furnace and remove flame sensor, it is a small metal rod on the opposite side of the igniter, use some steel wool to clean it up and reinstall it. If that does not solve the problem then inspect you filter, blower wheel for dust or dirt, also make sure the blower motor is running at the proper speed. I hope this helps.

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You will need to reset the furnace and have it run thru a cycle (or try). After three attempts, it will blink another error code that may tell you more.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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Bad or dirty flame rod.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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it means that the flame sensor is not sensing a flame. If the flame is present and nice and blue the flame sensor is probaly dirty. Remove the flame sensor and lighty sand it with sandpaper.

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