Vaillant EcoTec Pro | How To Change The Pressure Gauge 

REASONS WHY YOU MIGHT NEED TO CHANGE THE PRESSURE GAUGE:
The pressure on the gauge does not change regardless of what pressure is actually in the boiler. This is most likely due to there being a blockage in the copper pipe going to the gauge.
In this video I show you from start to finish how to change the pressure gauge on a Vaillant EcoTec Pro.