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    Ariston 27MFFI Modreg buzzing on standby, Wont fire

    This Genus 27 is similar to the earlier Eurocombi. It has a SIT 837 tandem valve with the modreg below it. With no htg or dhw demand, the boiler just buzzes from the modreg. Remove a modreg terminal, it stops. Boiler wont fire at all. Advice from Ariston is to replace left control pcb 953045...
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