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    Vaillant Boiler (Eco Tech Plus 831) - Water Presure

    How can I find the water pressure of my boiler. It stoped working and I got an F.22 message (water pressure 0.4 bars only). I turned on the tow gray keys under the boiler for a few seconds then off again and my boiler started to work. However, how can I find out what the current water pressure...
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