I emptied all the water from the radiators and afterwards the boiler gave me a low pressure error. I opened the filling loop to fill up the radiators again but nothing happened. Mains water was on, water was going through the boiler (opened hot water tap) but it seemed no water at all went through the filling loop.
There is a similar thread here:
//www.diynot.com/forums/plumbing/dreaded-ferroli-optimax-he-31c-wont-fill-with-water.390826/
But in my model, there are black knobs to open and close the filling loop, rather than the levers. The knobs seem to work, although there are lots and lots of turns.
Any idea what's wrong? The loop itself is a short copper pipe.
There is a similar thread here:
//www.diynot.com/forums/plumbing/dreaded-ferroli-optimax-he-31c-wont-fill-with-water.390826/
But in my model, there are black knobs to open and close the filling loop, rather than the levers. The knobs seem to work, although there are lots and lots of turns.
Any idea what's wrong? The loop itself is a short copper pipe.