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Ferroli Boiler Optimax HE 31C?

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Hi how to increase the water pressure on ferroli optimax 25C?

boiler indicating f5 causing ?

Replace a diverter valve?

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I have a Ferroli FF 77 the pilot light has gone out will not stay on ?

How do i get the water pressure up please?

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Heating coming on all times?

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Ferroli , Modena 102 Gas boiler?

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