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Boiler -foghorn sound at start up
kdean2001 Member Posts: 1
edited February 2022 in Radiant Heating
I have been researching this foghorn sound my boiler makes when the system calls for heat. It sounds like it’s coming from the vent outside. I have read it’s as easy as drilling a hole in some location. I say some location because I’m not at all familiar with boilers. A tech told me it was a 1200 dollar part. That is a very big difference. Is there anyone familiar with this sound? Thanks
If it’s a mod/con boiler, it has a negative pressure gas valve and burner. The use of CSST gas tubing can cause the fog horning.
Sometimes, adjusting the fuel mixture to the richest spec in the manufacturer’s I/O manual will alleviate it, but a knowledgeable tech with a combustion analyzer will be needed. If that doesn’t correct it, the CSST would have to be replaced with a larger size or with hard pipe.Bob Boan
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