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    vaillant ecotec gunged up?

    My Corgi registered Plumber fitted my Ecotec Plus 2 years ago. Last year it becamed gunged up and Vaillant replaced the heatexchanger. At the same time the plumber added a MagnaClean. Problem is looks like it's gunged up again, I'm getting s.53 codes and frankly it getting warm but the...
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