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I've just (finally) cleared a problem with my central heating system - the problem was that the pipe from the header tank was so furred up with limescale that the system was not re-filling. As water expanded, it was being ejected out of system overflow and top of system was left dry when things...

I have a confusing problem with my central heating system, and any assistance would be gratefully received. System is a fully pumped system fired by a Potterton Netheat back-boiler. When the system is activated, all seems to be correct: 3-way valve turns, pump starts and boiler fires. (Very)...