Can anyone advise if a hot feed and a cold return is a sign of a problem with the radiator being blocked, with the TRV being blocked or with the return pipework likely to be blocked?
Thanks
Hi This is my first post so bear with me.
My father in law turned his central heating on a couple of weeks ago and has told me its not working properly. He's got 3 rads downstairs and 4 upstairs. The boiler is downstairs, the hot water tank and pump are upstairs and there is an expansion tank...