Downstairs radiators problems - Worcester Heatslave Senior 6

[ccorns]

Hi,

I have a Worcester Heatslave Senior 6 combi boiler and over the last week or so I have noticed a significant loss of heat in the downstairs radiators. At the moment they are cold with the smallest amount of warmth at the tops of them (I have a two up two down house).

I have tried turning the upstairs radiators down (these are piping hot) but it makes no difference to downstairs. I have recently adjusted the pump speed to 3 and this also makes no difference.

Am I looking at a faulty pump or could it be a build up of sludge (or both)?
In any event, any idea of how much I would be looking at from a plumber?

thanks a lot
Chris

 

[ccorns]

and now no heat upstairs! I cant see a flame in the boiler?