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High Pressure in Pressure Vessel in Possible Unvented System

Postby Traveller1956_10 » Wed Feb 07, 2018 10:56 am

Hi, I think I have an unvented system as there is a little red tank attached to the main tank in the airing cupboard. The indicator is just below two but heating is noisy on startup. How do I reduce the pressure? Lady over 60 so simple as possible please.
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