Rattling noise above the furnace but not at the unit
Mechanical rattling or loud buzzing often echoes through the floor above as soon as the heating system clicks on, even when the furnace itself sounds completely quiet. Because the noise cannot be heard at the actual unit, it prevents people from identifying what the sound is and figuring out if they should be concerned.
What people tried
Every workaround mentioned in the threads below. We haven’t tested any of them — and nobody here is claiming they worked.
Found another way around this?
Share your steps and trade-offs so fellow engineers don't have to reinvent the wheel. No account required.
Rattling noise above the furnace but not at the unit
- 1inspecting the flue pipe for vibrations, disintegration, or separationDid this help you?
- 2Searching for online tutorials to inspect the systemDid this help you?
- 3Asking online communities for audio/symptom diagnosisDid this help you?
In their words
Unedited, grouped by where they were said, most upvoted first within each place, each linked to the thread it came from.
“as soon as our furnace clicks on, the floor above the furnace has mechanical rattling, but at the furnace, we can’t hear anything.”source ↗
Where this came up
People with this problem also raised
- 8Why does my furnace make a loud banging noise?
- 4Why is my older furnace running long cycles?
- 13Why is my AC making a weird noise when it turns on?
- 4Why is my boiler making a constant humming noise when heat is on?
- 2Furnace making a humming noise even when it is not running
- 2Furnace making popping sound and flame flickering