Over pressure on Vaillant boiler.

[beberex]

Hi all. First plea for help here so please be gentle.

I have a fairly new Vaillant TURBOmax boiler. It`s 4 years old but hasn`t been used for the last 2 years.
After bleeding the system down to 1.5 Bar the pressure very slowly rises to over 3 Bar and then starts ejecting water from an overflow.

I understand this is normal behaviour when the pressure becomes too high. By slowly I mean around 12 hours. It just gradually creeps up.

If I turn off the cold water input to the boiler then it doesn`t do it.

I have ensured that the cold water filling valve is completely off without trying to overtighten it.

Is it a faulty valve or some kind of setting at fault. It`s obviously just trickling through somehow.

Thanks for looking.

 

[lightning]

Looks like you need to repressure your expansion vessel as this is flat

//www.diynot.com/forums/viewtopic.php?t=37170

Or faulty filling loop have you turned this off

 

[bengasman]

...I have ensured that the cold water filling valve is completely off without trying to overtighten it.

How do you know it is actually completely off?

 

[Ihavenojob]

Pinholed plate heat exchanger

 

[Heat4input]

pump too strong

 

[bengasman]

pump too strong

You must enjoy making a complete tit of yourself.

 

[Heat4input]

pump too strong

You must enjoy making a complete tit of yourself.

You wanna suck?

 

[Gasman77]

what a gimp

 

[Heat4input]

what a gimp

i thought so too