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ok thanks folks. yeah it clicked in place, just wasn't sure if this ment it was open or closed/ on or off think i understand now.. thanks again

so does the pressure relief valve only turn 1 way?

Vaillant combi boiler VCW-GB 221 H What happens if you turn pressure relief valve? this was done by mistake and now water dripping from overflow, only a little... was turned once only 1 way... pressure at 1bar after refill.... heating seems to be working ok... but should i get a...