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pf76 01-13-2008 11:17 AM

Major gas heater problem.. Questions..Help!!
I recently purchased a house that has an old gas furnace(Approx. 20-25 years old). I have noticed from a couple of times a day right as the flame ignites it makes a very loud bang as it ignites. I have had a repair tech come out and clean it out. He said there was a lot of rust that he cleaned out. He said the heat exchanger is not cracked and tested ok for him. Of course after he left the issue has come up again and we had him come out again and it tested fine. Yesterday it happened twice and it happened again this morning. Yesterday I went up in the attic right after it happened and there was not a storng gas smell. We have now have it turned off, but we do not know what to do with it.

Does anyone have any idea what this might be??

redline 01-13-2008 02:16 PM

The pilot light may be out of adjustment and is not close enough to main burner.

biggles 01-13-2008 06:00 PM

if you have a gas stove you can see when you lite it the spark ignites the nearest gas and the ring lites as each picks up the flame...the same is comon on your burner the pilot is the only flame there and it should travel along a perferrated tube that sits just in front of each burner chamber( if you have this style) just above the gas header and when the main gas is OKd there is a flame to light all the jets that lead into the heat exchanger.that boom/bang is gas in the chambers delaying on picking up a flame off the "pilot header" so gas builds up in the enclosed chamber and finally lights!all this is if you have a gas header and galvinized burner tubes reaching into the heat exchanger from each openiing on that header.

pf76 01-13-2008 07:48 PM

Biggles: Is this repairable??

bigMikeB 01-13-2008 11:01 PM

biggles, you are assuming that there is good draft over the burner tubes, if there isn't an incentive for the gas to be drawn into the heat exchanger it can also have a delay in ignition, don't get fixated on one cause with out some more info. pf76, get a better tech to look at it.

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