D
Deleted member 1258
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Not sure who your question was directed to??
I fill it till the needle stops.... which is on the green, about 3.
Incidentally it has, strangely, been working fine since. Maybe (hopefully) it was just a blip.
It will still need topping up every 3-4 weeks which, after reading other posts, I can live with.
With the old boiler I don't remember it ever having such a problem.
I think 3 is too high, our old one was topped up to 1.5 then topped back up when it was down to 1, we've had a new boiler recently and haven't had to top it up yet.