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boiler vaillant p22

  1. M

    Vaillant p22 emergency

    Hello im housesitting and since yesterday i have no more hot water or heating. I checked in the cupboard there is a red light for the boiler. (See picture) The boiler is a Vaillant eco tech plus 637and it shows p22. I figured out that the boiler doesn't have water. But I don't understand where...
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