Vaillant eco TEC pressurre too high

[clueless30]

Hi i am really worried about my boiler, the heating did not come on this morning. It seems that the problem is caused by the pressure in the boiler - currently at 2.7 bar

this happened because of that F.75 fault, where i had to increase the pressure, but over did it.

is there any advise on how to get the pressure down to a 'normal' level.

no water is comming out of the outside pipe. i can run hotwater, but in the meantime swithched off the central heating.

 

[gas4you]

Under the boiler on the ch flow or return isolating valves, there is a drain off.

A square 'nut' that takes a 7mm spanner. Undo this and drain into a bowl.

F75 is not a low pressure fault. It is the usual faulty pressure sensor that plagues vaillants.

This needs to be at least removed and cleaned , or preferably replaced under warranty.

F22 is low pressure.

 

[Tipper]

Don't get too worried about the high pressure as the boiler has safety pressure relief valve that will discharge any 'over pressure', about 3 bar usually. You will find a copper pipe that leads outside, that is the pressure relief pipe.

 

[clueless30]

Thanks for the advice i will give this a try,

so do you think it would be safe to turn on the heating again?

My boiler is no longer under warranty, is it going to be expensive to replace that sensor, i obviously dont want to worry about this all the time, as it's the second time that the F.57 fault came up.

 

[gas4you]

For me to do this it would be £60 plus part, plus VAT.

Don't know what charges are like in your area.