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We have a new replacement boiler which repeatedly shuts down from low water and bangs at the moment of shutdown. The noise is coming from the Hartford loop. The attached photos show what I think is Squick , which needs to be removed. The contractor has returned 3 times to flush and skim, with very little improvement. Any suggestions?
Thank you all for your speedy response. Photos of the boiler are attached. The installer is coming tomorrow for a fourth 2 hour skimming session. I asked about possible chemical treatments to clean it out, no answer. The skimming seems to make a small improvement, but the junk reappears in a couple of days, along with the low level shutdowns and noise.