Hello, I'm new to this Google Group thing, so here goes.....

I have an Alpha CB24 Combi boiler at home and it's started to play up.
The central heating is fine but when you require hot water for say a
bath, it firstly comes out the tap hot and after about 20 seconds, the
boiler flame will cut out and the water will go cold and then the
boiler will fire up agan for the same period of time and so on....

I have heard rumours that this could be due to a blocked hot water heat
exchanger, if so, how easy is it to remove it and flush the blockage
out?

Would I need to get new seals for it and replace them?

Many thanks,

Ben