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    Vaillant ecoMax Pro not firing, no error codes

    Hi all, I'm hoping someone here can point me (and my heating engineer) in the right direction with this. I have a Vaillant ecoMax Pro 28e boiler installed and for years she has done us proud. Recently however, it's developed an odd fault. Every 3 or 4 days it just refuses to fire, but doesn't...
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