Low boiler pressure - filling loop not working

[BT643]

My Ideal Esprit Eco 24 boiler isn't working today (was working fine last night). It's just flashing F1 on the display.

Pressure is under half a bar on the gauge. Everything online says I should just be able to open the blue and black valves to top up the water in the system will the filling loop (which is located a bit further down the pipe in a cupboard) but I can't hear any water flowing when I open both valves.

If I switch the boiler off at the wall and then back on with the valves open, I can hear water for a couple of seconds, but then it stops.

Any idea what may be causing this?

 

[EFLImpudence]

The blue and black taps would have been open all the time.
They are nothing to do with the filling loop. Some filling loops have blue or black taps; yours doesn't.

You need to turn the screw in the left end of the filling loop. Return the slot to horizontal when the pressure is correct.

 

[ianmcd]

as above leave the coloured valves alone and use a screwdriver to open the filling loop valve till you have the correct pressure then close the valve again

 

[BT643]

Amazing! Thanks both, that's sorted it

 

[Madrab]

Make sure the slot on the valve is dead level, if not, the valve could slowly pass ending up in eventually over-pressurising the boiler and opening the pressure relief valve (prv)