Glow worm Boiler leaks when refilling

[thornton_chris]

Hi,
I have just drained my system and replaced two radiators.
When I try and refill the system all of the water comes straight out of the little hole shown in the attached pic.
I assume it is a pressure release valve and is faulty.
Before I get a plumber round I want to make sure there isn't something I can try first.
For example, what are the small metal things shown in the second pic?
Any help would be appreciated.
Chris

 

[CBW]

I’m not familiar with that setup, but it doesn’t look like a pressure relief valve, it’s a little more left than that. Could be diverter.

 

[Gasguru]

It's normal to leak a little.

In order to comply with the water regulations when a manufacturer has a permanent filling loop/link included in their boilers they must add a backflow prevention device to prevent the risk of contaminated boiler water flowing back into the potable (drinking) water. This one is known as a type CA device.

The mechanism inside shuttles back and forth when filling with an inevitable loss of water.
As long as it doesn't leak too much when filling or continue to drip when the filling valve is closed there is not a problem.

The metal "thing" is the retaining clip for the pipe...leave it well alone.

 

[Gasguru]

Just to add...
That's an old boiler given the pink pressure sensor.
Those sensors are pretty hopeless and were replaced a few times by alternative parts.
If you've got pressure problems bear that in mind...don't just keep filling to a higher and higher pressure.

 

[thornton_chris]

This is all good knowledge, thanks.
To confirm, it doesn't leak under normal working, and I don't get pressure loss.
I drained the system and it's only now that I want to refill the system that I'm having issues.
It doesn't leak a little, the water pours out as soon as I turn on the 'fill' tap.
Is there anything I can do, or do I just wait for a heating engineer?

 

[dilalio]

You could try releasing it and taking it out for an inspection/clean out but may need replacing... If system is drained and mains can be isolated then all you have to lose is time and maybe the skin on your knuckles, before having to call someone in anyway!

 

[ScottishGasMan]

Its a "disconnector" valve, typically they will drip after filling, if it stops after a minute or two then its not an issue, if it keeps dripping and the pressure drops down then its faulty and would need replacing, probably along with a few other parts as mentioned the pressure sensor may well not be working correctly, and on these models the expansion hose is prone to blockage.