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System is 60 size All been balanced No issue with hot water No balance valve Got me stumped Do u think dodgy cyl stat ?

put new valliant 624 in , powerflushed ect tf1 put new honeywell y plan kit , three port , room stat , programmer , cyl stat , 10 conector block wiring centre have problem when on heating only rads are piping hot ( good ) switch of ch put on hw and it works fine also put both on...