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Ran at p1 to get it to fire for the video. I have now replaced.. The expansion vessel. Heat exchabge. PCB. Issue still is persisting. This is a weird one

Hi everyone, I’m having some trouble with my Vaillant TurboMAX boiler and could really use some advice. Here are the symptoms: The boiler pressure sits at 1.5 bar when idle. As soon as the boiler fires up, the pressure rapidly increases to 3 bar, triggering the safety system and shutting the...