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Britony combi SE 80 by Chaffoteaux & Maury error 40/80 but CH pressure ok?

Britony combi SE 80 Boiler by Chaffoteaux & Maury,
i have the 40/80 "low waterpressure in CH circuit", but i have toped up the system to 2bar.
it has remainded at a constant pressure ie no leaks
also when drained the dial goes down to zero so gauge seems to work,
has anyone had to sort this problem out before.
thanks for any assistance

Martin
November 2009
Chaffoteaux & MauryChaffoteaux & Maury Britony combi SE 80Heating, Home Heating SystemsBritony Combi 80 Chaffoteaux
water pressure switch is blocked or has failed and will need replacing

Dean
June 2010
sounds like dirt blocking the pressure sensor in the boiler you need to drain boiler remove sensor and clean make sure that no dirt in pipe were sensor fits if this do`s not work replace sensor

Joseph Smith
November 2009

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Chaffoteaux & Maury Britony SE 80 Error 40/80