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vaillant ecotec pro

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    Vaillant boiler F75 fault

    My Vaillant boiler is showing an F75 fault. I have worked around it so far by topping up water (I bleed radiators when they are cold in the evening to do that) in the system on chimney sweep mode; this creates a small change in pressure to get ignition ( I assume) ; then CH works for few hours...
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