Thanks for the reply Lagdti.
I saw the list of codes, and i probably could get hold of them, they just have a couple of young lads on the service area and i think if I was polite enough they would let me have a copy.
I seem to remember one of the
codes (there were differing ones) mentioned the valve you refer to.
I've put some enquiries out regarding a 2nd hand unit.
I believe the unit resets itself upon fitting or refitting, but the settings should be checked.