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Do you think this may be cause of problems ?

Kevplumb Thanks its the second one any ideas what iuts for ? Thanks

I have a pottern suprima 70000 btu boiler, 3 port honeywell valve hotwater system is convetional cylinder with coil connected to primarys. When the central heating reaches temperature and if the hotwater is still calling for heat a noise descriped as a bang is heared from the location of the...