potterton combi boiler makes droning sound?

depends on model - does it make a drone during hw demand? If so there is probably air trapped in the boiler - check to see if there is an automatic air relief valve that may be jammed

peppered
December 2008

most combi boilers have automatic air vents fitted which release air whenever it passes through them. Very often they sieze and it becomes very difficult to remove the air from the system without the vent working correctly. IF your problem is related to an air lock, you will probably need a new air vent

gasmandave
December 2008