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Old 12-08-2007, 06:34 PM   #1
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Wall furnace blowing out


I have an old 30K+ BTU direct vent wall furnace that keeps going out. It will come on with the flame a nice strong blue color. Then, a moment later, all the flames turn orange and start to waver. This goes on for about 10 seconds then the flame goes out. Is this the valve not putting out enough gas or what? Gas flow to pilot is fine.

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Old 12-08-2007, 09:50 PM   #2
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Wall furnace blowing out


You can buy a meter for $80.00 - $160.00 to check the gas pressure. Or you can call a qualified tech which is your best bet. This isn't something a DIYer wants to mess with.

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Old 12-08-2007, 11:29 PM   #3
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Wall furnace blowing out


I know my gas pressure to the valve is fine as the other appliances run properly. I removed the burner and cleaned it thoroughly. There is about a 1" gap between the gas line coming from the valve to the entrance to the burner. Could too much air be getting sucked in there and disturbing the flow of gas?
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Old 12-09-2007, 06:11 AM   #4
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Wall furnace blowing out


I doubt it very much. That's the way it was designed.
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Old 12-09-2007, 02:04 PM   #5
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Wall furnace blowing out


is this in pilot mode or burn mode??

Suspecting it is pilot mode and you 'may' have a bad or malfunctioning thermocoupler. That thermostat looking thing that is in the pilot flame to keep the pilot lit. IF it malfunctions it shuts off the gas supply to the pilot as a safety. Easy enough to replace and while its off blow out the pilot gas line to be sure dirt or spiders havent nested in there in the off season!!

IF its in the burn mode,,suspect a bad gas valve,,its about all there is between the gas line and the burner!!

IF that doesnt solve it better have a tech come look!!
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Old 12-09-2007, 06:14 PM   #6
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Wall furnace blowing out


No, defintely not in "pilot" mode (burner would not come on). The possibility of a malfunctioning thermocouple is interesting except the fact that the pilot has no problem staying lit.

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