I have bled the radiators and drained the expansion tank. The noise sounds like water boiling or percolating in the boiler and it resonates thru the system .Any other ideas?ThanksKH
Sounds like a low water condition make sure there is enough water do you have a low water cut-off on the boiler?
Mine did that too. It's from the expansion tank, low on water, adjust the water volume and you'll be o.k. I put in a new bladder tank, very small with 12 pounds of working capacity and an air valve for charging. Think about it.
I have an espresso maker that i recently rebuilt, including a new boiler element. When I put it back on line after the rebuild there was absolutely no noise what so ever. After about 2 weeks of operation there is now noise that might be described as percolating. My guess is that build up of solids on the coil are somehow causing the noise during the heating cycle in the espresso machine. It had these noises before the rebuild also and I found a half inch of sludge in the bottom of the boiler.
There is still air in the system. Make sure you are maintaining a positive pressure (usually about 10-15 psi. at the boiler) in the system and keep bleeding air out of the highest radiators.
You're right! That sound you hear is water boiling. Excessive noise could be a result of sediment at the bottom of the tank rolling around in there. It is very normal. If you can't live with the sound, you may want to clean the tank, which is a very involved process. Try to insulate the pipes for sound and temp. loss.
