Gas furnace making low-frequency whistling sound?

Question

We have an old AO Smith gas furnace (Hydronic Boiler) with hot water radiators. Lately the furnace occaisonally starts making a low-frequency whistling sound (like a train) after it has been running for some time. The sound will stop if I shut the furnace off for a few minutes and then back on again. Furthermore, I have noticed that this sound will stop when the the burner shuts off. The gas burner will cycle off periodically (for a minute or so) while the the water pump continues to run. During this time when the burner is off, the sound goes away but starts up again when the burner restarts. This tells me that the noice is not coming from the water circulation system, but from the gas. Any help would be appreciated.

Answer 1

This is a hazardous situation. It sounds to me that a combustion problem is occurring due to the burners starving for oxegen (which will greatly increase CO production) or it is not venting properly because the flue is plugging or partially blocked (which alows CO to back up into the room the boiler is in). It is best you call a pro before you have a fire or CO poisoning. Seriously.

Answer 2

a great number of situations it truly is brought about with assistance from a unclean burner. The burner would not mild properly, or maybe as it does mild, the flame travels each and every of the before to the burner orifice the position the gas is assume to blend with air in the previous being burned. This creates type of a torch sound. this isn't accepted and not in any respect really a threat-free difficulty. you ought to have the furnace wiped clean and tuned up with assistance from a professional once a threat.

Answer 3

Need a good clean...there is a slight blockage in exhaust outlet

Answer 4

i would recommend agaisnt lighting anything in the near future. thats about all i can say.

Answer 5

seek professional advise for your own safety