Combi Boiler leaking from filling tube

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Help!

I have a Worcester Greenstar cdi classic boiler and it's got water pouring out the filling key tube.

I refitted a radiator yesterday that had been off the wall whilst decorating, I bled the radiator and then checked the boiler and it was showing 0 pressure. In the normal way, I inserted the filling key (aligning with the open padlock) and twisted the white knob to begin repressurising. As it got towards 1.5, I turned the white knob off but the pressure continued rising and finally aettled around 4!

I since bled the radiators to reduce the pressure back to a normal level.

The issue is, whenever I turn the mains water on, water pours from the filling key tube. The pressure of this increases the more I open the mains water. I can see that there is a small hole (looks like it should be there as opposed to a crack) about halfway up the filling key tube and this is where the water is coming from.

The white repressuring knob is definitely closed, I have used a spanner to tighten.

The boiler seems to be working ok otherwise but obviously just the issue of the water coming out the bottom!

Any help would be greatly appreciated!

Nick
 
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If the fill loop is in the locked position, and continues to leak? It could be the seal has failed or there is debris stopping the seal closing. if you leave key in does that stop water leaking?
 

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