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modureg adjustment?

i am unable to achieve any adjustment on a new gas vale. Have followed the normal procedure but end up with no modulation. The boiler is a Worcester 240 RSF combi about 10 or 11 years old
ATG, January 2010
they are a pain in the arse to adjust for some reason, as the gas valve is much the same as on most bolilers of this age, best to call worcester for advice.

Ian, January 2010
link Click here to see other fixes for Worcester 240.