overfilling my boiler

[fishface2]

Hi there,
I have a Vaillant thermocompact boiler which i managed to overfill and the pressure bar has gone up to 3. The last time it reached this number it started leaking. How can I get the pressure down? If I let a tap run the gauge goes down but shoots right back up when the tap is turned off again. What can I do?

Thanks in advance.

 

[spacethegas]

sorry you've lost me.

 

[fishface2]

Basically my pressure gauge has gone up to bar 3 and I need to reduce it. Can anyone help? Sensible advice please not daft philosophising!

 

[ChrisR]

The mysterious bit is that the tap shouldn't affect the boiler pressure, unless you've left the filling loop open. It should be left disconnected.

Drain some water out of a drain cock, or keep "bleeding" a radiator until enough water has gone all over the floor.

 

[gasmick2]

Hi it sounds like the plate heat exchanger has a pinhole in it, allowing the cold mains to pass into the other side making the pressure rise, i had the same prob on a worcester boiler could mean a new plate heat exchanger

 

[holty]

could be youve left the filling loop open resulting in your mains is about 3 bar. not enough to release the prv. but your linking your mains water with ch water, summit doesnt sound right.been known check valves failing on filling loops.

 

[superdupergasman]

Is there a drain point on the system??
some place around the outside of the house perhaps??

If not the blead a rad into a bowl.

the gauge will move down as there will be a negative pressure from the pump when in kicks in to heat the boiler.