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    Saunier Duval F30e problem (CH fine, HW tepid). Is this diaphragm usable?

    Hello (and thanks to anyone who replies), The temp of the HW supplied by my boiler recently fell, and it also now takes much longer than before to get hot. If the CH is on at the same time as running the tap, though, the HW is as hot as it ever was. Page 36 of the manual (link below) suggests...
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