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Ok thanks for your help!

It's a vaillant, there's a digital screen that shows the pressure which is what I observe increasing and it doesn't match that gauge in the picture that doesn't change

Thanks so much for your replies! So what the gauge is set to is ok (red / black)? I didn't observe any pressure relief valve lifting, the pressure just keeps rising. Is the EV affected by the boiler being off? When I moved in the boiler was off - maybe for a long time? I'm not sure. Would...

Hi everyone I'm having issues with my combi boiler. When the central heating is turned on the pressure keeps rising to 3.7+, when the hot water on it rises to around 2.1 and when it's not heating the pressure is around 1.5 bar. There is a filling loop that's detatched but I can't find where it...