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have followed the proceedure given by worcester, ie dump the water pressure the charge the ev. quite frankly do not like your attitude :evil:

i am going to use an external vessel this time, and i have tried various pressures from 1/2 bar to 1.5 bar Thanks

when i turn on the heating after 5 minutes when the rads are hot the pressure goes over the top and the relief valve dumps the excess pressure therefore shutting down the system with low pressure. i have checked the vessel pressure and set it to manufacturers 1/2 a bar

sorry do not understand your reply

just wondering what the norm is for laying water pipes in concrete floors. Concreteing beetween house and garage and running pipes to washing machine, hot and cold

7 radiators, have checked pressure and reding one bar

i have had my new boiler, worcester, for 4 years, and in this time have had to replace the expansion vessel twice in the past and again now. Has anyone any idea why they only last a short time as i am having to change it more or less every winter. The vessel is 8ltr. on a WORCESTER 28i JUNIOR