Vaillant EcoTEC plus 637 - Water Pressure in red

[Johnc28]

Hi all,

I'm in need of some advice please. I have a vaillant ecoTEC plus 637 and the radiators in the top floor were too cold so yesterday I checked the pressure gauge on the boiler which was showing it was too low and the digital display was flashing.
I refilled to get the gauge to the recommended grey area and then went to bleed two of the radiators which let out a fair bit of air and promptly heated up.
Today the display was back down again and the display was flashing again so i topped the water up again to about 2/3rds of the grey area. I've fired up the boiler and the indicator has shot up to the red area and the digital display is flashing again - this time to high ! Should I be worried ? Any idea on how to reduce the pressure ? Any help appreciated.....

 

[Steelmasons]

Have an additional expansion vessel fitted as this will solve all existing and future problems.

 

[Johnc28]

Have an additional expansion vessel fitted as this will solve all existing and future problems.

hi there, thanks for the advice, it started to drop from the red area on the dial and was sitting at the top end of the grey are as the evening went on. I'll just have to keep an eye on it.... Thank again.