Coal Back boiler intermittently heating water

[aetos]

I have a Parkray 99 coal back boiler which I struggle to understand! After having the chimney swept, I lit the fire and put the front top lever to the left and it heat the hot water up great. The next evening, it heat it up a bit then stopped, and now it isn't heating up the hot water at all. I've moved the lever about and tried changing the dial on the left hand side.

The radiators are nice and toasty, which is something. Any one got any ideas about the hot water? Both tanks in the airing cupboard have water in them.

 

[cross thread]

Maybe air lock have you any air vents by the cylinder

 

[aetos]

Don't know -what am I looking for? I have two open tanks above the hot water cylinder

 

[gas112]

Don't know -what am I looking for? I have two open tanks above the hot water cylinder

check that they have water in them and ball valve has not stuck

 

[aetos]

they do indeed have water, and the ball valve seems good