worcester filling loop key problem

[blackhead]

I have a Worcester 24i junior combi boiler with an integral filling unit. When repressurising, I had a vague idea about inserting the key in, turning it in some direction, and then turning the white knob to the left to let water in to repressurize it. It worked. But then I discovered I hadn't pushed the key fully enough to start with. I pushed it in fully, and then proceeded to turn it to the unlocked positiion, whereupon, I can remove the key, but water keeps coming out when i try to remove it.

The white knob to the left is fully in, so it's water from the boiler that's coming out when i try to remove the key.

I haven't strained any components so does anyone have an idea as to what i can do?

Cheers,

Larry.

[stuart noble]

I'd try lubricating the key with washing up liquid and shoving it in and out a few times (it turns clockwise and locks at about half a turn on mine). You could always leave the key in if that stops the flow.

[blackhead]

Do you know how the mechanism works?

It would be useful if there was an exploded diagram of the device so I could work out what might have gone wrong. It's weird that the locking and unlocking sensation is still there, but the device doesn't work, for what ever reason.

[Mathew Newton]

The idea is that you require a means to fill and pressurise the system from the mains however there must be no risk of system water being admitted back into it (e.g. if you were to lose mains pressure).

In this case the white key is used to bridge the gap inside the filling loop device - one side of which is connected to the mains, and the other to the boiler via a non-return valve. The gap ensures that water from the system cannot possibly return to the mains, unless of course you leave the key in.

The non-return valve stops system from emptying when the key is removed, however it sounds like yours might have failed. How much water is coming out? Is it definitely from the boiler side and not he filling side? Some water is expected - i.e. a good few drips.

Mathew

[blackhead]

The water squirts out under hight pressure, filling a small cereal bowl if I let it.

It can't be from the main's side because i can still control the pressure by turning the white knob with the key in either the locked or unlocked position.

It looks as if the mechanism has failed, but understanding why needs and understanding of how it all works, how the valve works, does turning the key too far to the locked position cause the valve to get stuck because of the way it's designed?