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    Ferolli optima 701 not firing up

    Hi, I,ve got gas combi boiler that is not igniting so no DHW or CH. Power supply is OK, but fan does not start at all. Fan relay RY4 is checked and is OK, also fan is fine on its own - if relay bypassed combi starts OK. Pressure is 2-2.5 bar. Any help please?
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