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Please help,
I have a potterton netaheat system and it has just started to overheat and puts hot water and steam into the expansion tank in the loft. I tried to drain the system to see if there was a blockage but the expansion tank will not drain down. Any ideas on locating the blockage without chopping the pipes to pieces.

regards ed

hi edd this is dangerous the pipe from the small roof tank is almost certainly blocked between tank and next tee piece basically cut out and fix all best john