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Hi The main housing with the pipe work connections - has two arrows either side. Need to note these in terms of getting it back in the right position, particularly if not familiar with the flow direction of the system. The main pump unit once seperated has no markings and can fit back in...

I searched in vain for a solution to my central heating problem. My experience may help you. Symptoms were no heat getting through to upstairs radiators at the end of the line of an open vent system. Went through lots of flushing and checking for a blockage in the radiator pipe-work to no...