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We actually don't let it get to 3 bars. We normally keep it at say 1.2, then it will rise by .3 bar a day, we assume it will eventually reach 3 bars, but try to keep it at the lower level by taking water out of the rads
Sorry we don't really understand this, as if we left it - and did not take water out - it would keep rising by .3 each day. We feel that there is water getting in somehow. When there is nothing being used, overnight for example, this when we notice the presure rise. We are aware that it does rise when the hot water is being used but the new expansion vessel controls that. The rise is even when there is no heating or water being used.
Thank you, ***** ***** thing we have not checked is the coil, we'll have a look in the manual to find where that is.