How to change a 3 port motorised valve on an open vented system

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How to change a 3 port motorised valve on an open vented system, This is a simple task that most handy DIY'ers will be able to do.
If you are not getting any hot water or the heating and hot water are coming on together then you may need to replace your 3 port valve.
This is a great video to help trainees or people new to the industry.
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