Had to find a pub to warm my fingers...
I have an Ellis Heatmaster on my nb and has worked fine since I fired up for winter, until now.
I had the heating on for a an hour or so the other evening and noticed it had started to chill off despite the boiler still burning. So for an hour the radiators had been working as normal, but then suddenly just stopped. As if blocked, which I suppose may be the problem.
I wanted to drain the system, but have two questions. Firstly, is this the best thing to do? is it sludge or something in the system that is most likely? and secondly, how do I refill it? there is a small open topped box above the boiler with three pipes. The first is connected to the fresh water and on the left of the box, and has a valve on it which when opened pumps water into this little box. The second, at the bottom of the box, is connected to the top of the boiler and top of calorifier, and its behaviour suggests the whole box is like an expansion box (?). The third acts as an overflow, and the water drains into the engine bilge.
I just would like to understand this system a bit more, and most importantly fix the problem that means I can heat water but not the radiators...
Any help much appreciated, thanks!
Andrew