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    Vaillant Turboxmax 824E Combi

    Help!! I have a Turboxmax 824E which is about 3 years old and recently I keep getting a red light come on and the display shows an F28 error. The manual tells me that it's something to do with a 'lock out' but it doesn't tell me how to remedy the problem. I can reset the boiler so that the...
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