Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.
Boiler -foghorn sound at start up

kdean2001
Member Posts: 1
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
0
Comments
-
-
-
-
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
You can choose to do what you want, but you cannot choose the consequences.1
Categories
- All Categories
- 86.9K THE MAIN WALL
- 3.2K A-C, Heat Pumps & Refrigeration
- 57 Biomass
- 425 Carbon Monoxide Awareness
- 109 Chimneys & Flues
- 2.1K Domestic Hot Water
- 5.7K Gas Heating
- 105 Geothermal
- 160 Indoor-Air Quality
- 3.6K Oil Heating
- 70 Pipe Deterioration
- 976 Plumbing
- 6.3K Radiant Heating
- 387 Solar
- 15.4K Strictly Steam
- 3.4K Thermostats and Controls
- 54 Water Quality
- 44 Industry Classes
- 47 Job Opportunities
- 17 Recall Announcements