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worcester greenstar 25si boiler radiators not heating up ?

select the on posistion for heating, boiler fires up then seems to cut off after about 10 seconds, getting hot water ok.
ronnie, December 2008
i have a worcester 25si boiler and it was working fine until some builders took off 2 rads and then put them back on there are now only 2 that fully heat up and the rest just heat up a tiny bit or not at all and all rads have been bled

mr s blaine, December 2008
link Click here to see other fixes for Worcester Bosch 25Si.