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My Ruud Furnace wont stay lit

This heater will start as normal with a fan stating to run for a minute then the burner will ignite and go out almost immediately so we dont get any heat.

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  • bmreid Dec 15, 2008

    I have the same issue. It is sporadic though. It won't work for a while and then will work for a week or so and then won't again.

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Get a new furnace.

Posted on Jan 20, 2009

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Hi Bmreid
The problem you describe sounds pretty much like your gas valve is going bad. There is a brand by Honeywell called a Smart Valve which is anything but smart, when the electronics in the valve start going bad the furnace will run great for a day or two and then the next day may not run at all and then an hour later my run and then an hour later may not run again. Very sporadic operating furnace is usually the Honeywell Smart gas valve going bad.

Posted on Dec 17, 2008

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Pull your flame sensor out from in front of the burners. It is about a 3" long metal rod. Clean it with a piece of sand paper and then reinstall it. It should work fine.

Posted on Sep 20, 2012

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Hi my sister's furnace won't stay lit the burner that hits the flame sensor won't lit is it the gas value

Posted on Feb 09, 2009

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The heater turns on, but does not ignite. The fan runs for about 5-7 seconds then shuts off. I am assuming the heater needs a good cleaning?


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The first thing I would do is make sure the flame sensor is clean, this is a metal rod immersed in the burner flame on the opposite side of the igniter. If too much oxidation builds up on it, it will not allow the burner to stay lit. To clean, just turn off furnace and remove flame sensor and clean with steel wool and then reinstall. If this does not solve the problem there may be a problem with the gas valve.

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Goodman furnace gmh95090cxac wont stay lit keeps clicking will lite then clicks back off what would be the problem


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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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