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Mend Vaillant turbomax plus Turbomax Pressure Problem

valliant turbomax plus water pressure problem?

just had dhw heat exchanger fitted and now water pressure for the ch keeps rising unless l turn water off at stop cock
have disconnected filling loop
hw and ch seem to work fine
l live in a hard water area so could there be lime scale in diverter valve
would that be a cause of the problem?

charles cavanaugh
May 2016

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