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there is a 15mm bypass at the pump, boiler is not really noisy,makes a slight noise when it comes online,but i think this is from the fan. thanks.

water does get hot after a while/ one rad in hall way gets fairly warm others virtually nothing/pipes to rads are warm but seems to end there have drained and filled afew times.sounds at times as though their is air in system around the boiler. property is/bungalow with cylinder/pump in the...

thanks for reply fitted new 3 port valve but problem still there

boiler classic ff250-boiler goes on/off every minute roughly pump keeps running but romstat and cyl/stat dont reach set point even when run seperate any help appreciated