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“Tinkling” sound in system
Gas boiler system with original 1930s rads and metal expansion tank.
This last day or so it sounds like a tinkling sound coming from pipes/expansion tank in the boiler room. It happened around this time last year as well and lasted for a few weeks. Hasn’t happened until now this heating season
Not sure if a pipe is loose or there is something in the tank- it’s like the sound of a small piece of metal moving or the sound when a pot lid rattles when boiling .
Expansion tank was emptied and recharged weeks ago.
Any ideas ?