system overheating and will not drain Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[eddiec46]

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

[johnb]

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