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I've had it serviced every year.
My uneducated guess is that it's an oil burner noise that resonates throughout all the pipes/radiators in the main zone.
The heat kicks on. I hear the blower...

Just to clarify, it's not a knocking sound. It's a loud vibration/rattling when the heat first kicks on (for about 20-30 seconds) during whatever the first "process" is.

Thanks

Hi hvac1000,

I apoligize in advance for my ignorance as I know very little about oil burners. First, my initial description is wrong. Last time I tried to figure this problem out, the "metal...

I have a Weil McLean Gold Oil Burner (hot water heat) that was installed about 4 years ago. At that same time I had an addition put on our house so we now have 4 zones. Whenever the main zone kicks...