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I have changed my ch pump the cylinder is a primatic direct feed. The boiler wont fire up and my service engineer says it is okay and there is an airlock but he wont touch it cause i changed the pump (its political)how is the best way of getting airlocks out of this type of system. ive bled all the rads and no more air is coming out. Could there be a lock in the cylinder and how do i sort it?