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Furnace will not light. Igniter glows but no gas

Furnace will not light. Igniter glows but no gas flow. We have another furnace for upstairs that works fine.

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Make sure that the switch on the gas valve is in the on position. If it is and the gas valves coming into the furnace are open, you probably have a bad gas valve.

Posted on Oct 04, 2009

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My furnace will not ignite


If it has a glowing igniter, that must mean it is a Gas furnace?-- LP or Natural Gas?-- We need to establish a few things like:
1.) Is there a good supply of Gas?
2.). When the Igniter starts to glow, can you hear a gas valve click'?- and then is there a small flow of Pilot gas? (over the area where the burners will need to flow gas-- so the gas in the burner tubes can be ignited safely.)
3.) There is a circuit somewhere in there, that detects that you have established FLAME-- (Usually a 'flame rod' that allows the main gas valve to open.) Can you see the 'pilot flame' touching that rod? A very small electric current is actually conducted thru the flame, -- completing the circuit that allows the safety circuit to go to the next step, before it opens the main gas valve.)
These things have to exist, before the safety circuitry allows the main gas valve to open.
Tell us more, what you observe, as you try to start it again.
Mack B

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Check along the gas supply line to the furnace and make sure there isn't a valve that is shut off. If you have a gas oven see if the ranges light and have gas. I'm assuming you've also turned on the gas supply at the furnace itself as well. Check that the furnace has electricity it won't be able to open the automatic valve let alone fire the igniter. My brand new furnace had a safety switch that went out 3 days after installation preventing it from lighting. You might contact Arcoaire about that. http://www.arcoaire.com/

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If yours is a high-efficiency furnace, you should hear the stack blower start running when your thermostat calls for heat. Next, the igniter should start to glow and remain glowing until the thermocouple opens the gas valve and allows gas to flow to the main burner. The main burner lights and burns until sufficient heat is generated for the main blower to turn on and blow warm air through your house. If any action does not occur in the order described, repairs are in order.

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tony this is a gas furnance do you seee a orange glow on the right hand side of unit

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Based on your model number this furnace does not have a pilot light,instead it uses a hot surface igniter.typically it glows and when it gets hot enough the gas valve will open and the burners will light.When the igniter starts to go bad it will glow but not get hot enough to open the gas valve.If your furnace lights and the quickly goes out the flame sensor maybe dirty.

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50E47-70 unit intermittent failure. HSI glows, gas valve clicks, but burner does not light. Cycles several times but does not light then flue fan continues to run until furnace shut off. Sometimes...


Hello, sometimes even though the igniter is glowing it can be weak and not able to ignite the gas. Also, since the gas valve is clicking that means that it is receiving 24 volts but it is also possible that gas valve is sticking and not allowing gas to flow to tne buners everytime.

Sep 06, 2011 | Heating & Cooling

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Check all of the plastic tubing that connects to the pressure switches for any moisture build-up, crimps, or cracks and correct as necessary. :-)

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I have a Carrier Weathermaker 8000 furnace. it will not light.I tested the igniter on my upstairs furnace and it will glow and light that furnace. I can manualy light the furnace with a match. flame sensor...


If you're sure the igniter is good and the controller is sending voltage to gas valve to open, but not to the igniter then, yes, the controller is bad. The only way to know for sure is to remove the igniter's molded plug from the board and test voltage directly at the board. You should get about 100-120 vac to the igniter.

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Be sure that that PVC vent pipe going outside is not plugged or trapped with water. If the vent pressure switch is not tripping the furnace will not ignite. Also be sure that you don't have a gas leak somewhere causing weak gas flow to furnace.

Dec 21, 2009 | Goodman GMS90703BXA Heater

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