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is there a way I could check this? I believe the 3 way valve is about 5 years old (Honeywell) as it the pump (Grundfoss) and stat (Honeywell) t6360b. Is there anything that could be adjusted to shut the boiler off quicker ? Appart from this, I am considering replacing the room stat...

I am getting the same symptoms and after the heaing cuts out on timer or reaches desired temp I get a banging on pipes around pump and back at the boiler also the expansion pipe gurgles and splatters back into the tank. Feroli sigma 60 y plan, grundfos pump on speed 3 no air in rads...