Loud rattling throughout house when heat turns on for one zone only
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 on, there is a loud rattling/vibration noise throughout the house (essentially where ever there are pipes/radiators for that zone) for about the first 30 seconds. If the burner is still on for a long enough period, the rattling will start up again. In the winter, if the pipes are cold, the rattling is even louder.
I don't know the first thing about how the burners work, but do know that there is a metal "box" at the front of the unit and a little light will turn on when it first starts up. When that light is off, there is no rattling. I think there may be a different light for each zone.
Again, this is only for one zone. No issues when the heat kicks on for the other zones. My oil guy can't seem to figure it out.
Thanks!