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Thanks for that. will try

Hi mate i think between £70 and £80 quid

Hi yea change the whole unit. Bloke in shop said if i had twisted the cap should replace that as well :roll:

excuse my Ignorance but is the diverter valve on the right hand side of bolier and have a red plastic cap on and has the pressure gauge attached if so have changed this Regards Chris

Hi people i have a potterton 80 ,perm thermastat. For hot water boiler fine, first thing in morning heating great untill someone turns on hot water tap then the heating will not come back on again :cry: Have changed just about all parts i can, fan, pump. themo coupling,dhw,switches but no...