urgent, heat needed

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  #1  
Old 10-25-08, 01:31 PM
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urgent, heat needed

Right to the point. I have a coleman/evcon gas forced air furnace model # BGM07516AX. After thermostat calls for heat the electronic ignitor glows but no gas is ignited. It will cycle thru 3 times like this before it shuts down and indicator blinks oneblink,oneblink oneblink,etc etc. indicating ignition shutdown. The gas is on inside the furnace and outside furnace. i can hear it click when in the process above. Also last year I had to clean the flame sensor twice but I don't believe it would have these symptoms. i would try to check the gas valve if I knew how.
 
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Old 10-25-08, 01:51 PM
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If you are hearing the click at the gas valve, then that works.

Do you have the gas shut off near the furnace? Do you have other gas fired appliance in the home? If not, did you pay for your gas bill?
 
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Old 10-25-08, 02:02 PM
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Ignitor may be weak where it is not glowing hot enough. You could test the wires to it, doing an ohms test.

Feel the gas valve so you know the click is coming from the gas valve trying to open, and not the ignition control shutting down the ignitor. Also best proof is to test to see if 24 volts comes on when gas valve is to open.

Flame sensor and system venting is not the issue at this stage. And I think if you have a damper control on it, that the HSI would not be able to come on, if that were the case.

Has this furnace already been running this heating season? If yes, we could probably rule out gas quality issue.

If you have natural gas, you can go out and look at the meter at the 1/2 foot dial, and see if the meter changes position after you run it. If the gas really is coming out, and simply not igniting from say a weak HSI, the meter should still spin for 4 seconds.

If it does not, then we have to more carefully look at gas valve voltage or the possibility of a hangup in the gas valve that maybe could be fixed by rapping on the gas meter.

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BTW -I always enjoyed watching Dr. Smith
 
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Old 10-25-08, 04:51 PM
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Coleman-Evcon

I'm not familiar with that particular model number. Is it a single burner or several strips of burners? If the furnace has not run this year & especially if it is a single burner, sometimes a spider will get in behind the orifice, make a nest, & block the gas flow.
 
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