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how to fix my WORCESTER 28si II COMBI?

THE PROBLEM IM HAVING IS THAT THE CENTRAL HEATING WILL WORK FOR A WHILE THEN GO OFF AND THE RED LIGHT WILL COME ON SAYING THERES NO GAS.THE PREASURE SEEMS TO BE DOWN SLIGHTLY,ITS THE SAME WITH THE HOT WATER ITS OK FOR A BIT THEN GOES COLD.
ANDY SPENCER, April 2008
same problem here,but now it will not ignite on the 2nd stage burn so now no hot water or central heating. have replaced the board,gas valve,air flow switch,set of electrdes and a flame sense electrode. all the work has been carried out by a very experienced engineer and he is now lost as to what it could be. and i am now quite a few pounds ,out of pocket. Please HELP!

Colin Trout, August 2009
We are having same problem here, We called a technician, he said it's a pump :/

Michal PL, May 2008
water keeps on coming out of the boiler

sharon, April 2008
first make sure pressure is about 2 bar.
check if auto air vent is working you may have a little air in the boiler.
but it sounds like it may be the high limit stat is on its way because you have to reset it but its hard with not being able to see it working

plums, April 2008
link Click here to see other fixes for Worcester 28si.