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  1. M

    Vaillant boiler ecoTEC plus 937 problem...

    Hi, Got home from christmas to find the house like ice! I turned it off before I went away as I was worried about the F22 error that had suddenly appeared. Now it says there is low water level (0.3 bar) & that I need to turn the safety switch off. can someone help!? it's freezing, would...
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