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how can i clear blockage between tank in roof and hot water cylinder?

the tank in the roof is full but is not draining into the hot water cylinder, ballcock is working ok but seems to be something blocked in the pipe that feeds hot water cylinder
alison, June 2007
it could be scale build up in the bottom of the cylinder stopping the water from entering

dave wellard, June 2007
turn on your hot tap, and place a hose down the inlet inside the tank then turn on the cold tap that the hose is connected to. if this dosen't shift it it may be the gate valve half way down the pipe in the airing cupboard may have broke and blocking pipe.

hi-spec plumbing, June 2007