I am having a bit of a problem with my heating. Its a valiant combi boiler and the hot water is coming out fine but the radiators are slightly warm and the top and colder as you go down. I've checked the link the the portable controller and that is fine, the boil seems fine and is going through all the steps it needs to do to heat the radiators etc.
Over the last few days the radiators are getting colder. They come on at the correct times and go off at the correct times but are just not getting hot enough!
Any suggestions as i've not got a clue and am stumped!