Gas furnace not igniting - blows cold air

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  #1  
Old 05-28-14, 07:39 PM
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Gas furnace not igniting - blows cold air

Hi,

This is a 12 yr. old American Standard furnace, forced hot air. I haven't had any problems since I bought the house 10 years ago. The igniter goes on but it doesn't light. Problems started when I went away on vacation and turned the heat down really low. When I came back, the heat sometimes blew cold air. I was able to reset the furnace by cycling the power, that would usually ignite it but then it gradually took multiple times to work. Now I can't get it to light at all. I try to restart the furnace but Here's what happens:

- I turn the power on, the system hums
- The igniter lights (it's electric and I see it glow)
- The igniter goes off at the same time I hear the hiss of gas
- the igniter gradually stops glowing and the hiss stops, but no burner ignition. It used to just fire right up.

Is there anything I can do to fix it? It seems like more gas needs to come out after the igniter stops, or the igniter needs to run a little longer. It's like the timing is a bit off. I suppose it also could be the igniter isn't hot enough or in the wrong position? Anyone have any ideas?

Thanks,
John
 
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Old 05-28-14, 09:25 PM
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Welcome to the forums.

If that is the original igniter still in the furnace...... replace it first.
 
  #3  
Old 05-29-14, 08:16 AM
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Thanks - It may be original. Can I replace it myself or should I call someone? Is there a good site to buy them online?
 
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Old 05-29-14, 09:04 AM
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North American HVAC
HVAC Parts Outlet - Home
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It's a fairly easy job. The igniter is held in with one screw and it usually plugs into a wiring harness. The places above are just a few online stores. There should be a part number on the igniter and you can search with that number also.
 
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