Vailant ecotec plus pressure 3.5 - can't get pressure down

[Oldboilernik]

Hello

Our boiler pressure dropped so I topped it up with the fill value on near the big tank upstairs but the pressure have now gone too high 3.5

I've turned the boiler off downstairs and drained about 5 litres from the rad but the pressure is still the same.

What am I doing wrong? Do I need to switch off somewhere else as well or can I drain from somewhere else?

Thanks for any advice

 

[willsgas]

Are you sure the filling loop is closed properly?

 

[Oldboilernik]

I've checked the and can't tighten up any more and the dial isn't raising and the tank isn't filling.

The other think I have just noticed is that when we call hot water the boiler is dripping from underneath - probably because of the high pressure?

 

[willsgas]

What type of system do you have?

 

[Oldboilernik]

Hi

Vaillant Ecotec Plus 630 Condensing System Boiler.

With a VRC400 Control Panel (I think that's what it is)

We also have a large tank upstairs with it? Boiler are not my area really so not sure if I have given you the information you need here?

N

 

[willsgas]

When you say "tank" do you mean cylinder? if so do you know if its unvented or vented, ie do you have tanks in the loft?
Where did you take the 3.5bar pressure reading from?

 

[Oldboilernik]

Hi

Its a cylinder a cupboard - its an unvented hot water cylinder. In the cupboard the pressure is 2.8 on the dial, but on the boiler its 3.6 when pressing i

 

[willsgas]

Try and drain more out, any drain point on your heating system should do.
The pressure should drop unless your filling loop is letting by or you have a problem with your cylinder or boiler

Did you fill it up to 3.5bar or did it go up on its own?

 

[Oldboilernik]

I managed to fill it to that by not paying attention!

Will switch cylinder and boiler off and try again

 

[dreadnoughtheating]

The difference in gauge and digital readings will be well known to Registered Gas Installers on these appliances.

I suggest you find a GasSafe Registered Engineer to investigate and remedy.

As per forum rules, no safety critical advice is given.

DH

 

[Oldboilernik]

Thanks for all your advice I had left the fill open a tiny bit but all pressure back to normal.