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Old 10-28-2011, 11:57 AM   #1
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furnace runs, blows almost warm air


I have a small Coleman furnace in a mobile home. When I tried to start it up this fall, after installing new filters, it fires up but only blows slightly warm air. The flame through the sight glass is blue, no yellow, but not very large like it should be. The air volume out of the floor vents is normal, just not hot.

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Old 10-28-2011, 02:06 PM   #2
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furnace runs, blows almost warm air


May have a spider web in the orifice.

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Old 10-28-2011, 02:16 PM   #3
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furnace runs, blows almost warm air


Also the gas pressure should be checked into and out of the gas valve.
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