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Update - now sorted. After realising it was a swich (diverter valve) rather than a screw I released the philips head slightly and managed to twist the RHS butterfly (which ultimately will need replacing as it just turn 360 degrees) so turned off the supply valve and re-connect the cold...

Thanks Lee, I have tried but the RHS does not close fully by twisting the grey plastic butterfly. There is a philips head in the centre which also won't fully shut off the supply. The LHS opens and closes ok. Am I just not tightening it enough? I don't want to force anything and do...

Hi all, first post so please be gentle with me. I have a problem with my Vaillant ecoTech system. It is only 3 years old and has given no problems to date apart from occasionally needing to be topped up. Yesterday I topped up the system but did not close the valves properly. The heating...