main combi 30he

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    Main combi 30HE very odd problem

    Hi Guys, i wondered if anyone would be able to shed some light on this problem, i have a Main combi 30HE that i have had for the last 7 years, but just lately the diverter valve stopped working (no movement of either pin) so i got a brand new one along with a new plate heat exchanger, while it...
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