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Honeywell st9400c to Hive v3 smart
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<blockquote data-quote="kerching" data-source="post: 550294" data-attributes="member: 11861"><p>You have, by the look of it, a Y plan system ( the work of the devil and all his little helpers)</p><p>But you've got it and are stuck with it. DONT PANIC</p><p></p><p>CH off is not required</p><p>You need HW on</p><p>HW off</p><p>CH on</p><p>Line</p><p>Neutral</p><p>Earth</p><p></p><p>Best option is to find the Wiring centre/joint box and get rid of the room stat by joining out the L and Switched L and remove the neutral</p><p>That way you can remove the now redundant room stat OR leave stat in place, don't touch Wiring centre, join heating call and switch wire together in the room stat and leave it. Most likely red and yellow BUt look in the stat manual to confirm. If it bursts into flames it ain't my issue as I'm not there<img class="smilie smilie--emoji" loading="lazy" alt="😉" title="Winking face :wink:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f609.png" data-shortname=":wink:" /><img class="smilie smilie--emoji" loading="lazy" alt="😂" title="Face with tears of joy :joy:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f602.png" data-shortname=":joy:" /></p></blockquote><p></p>
[QUOTE="kerching, post: 550294, member: 11861"] You have, by the look of it, a Y plan system ( the work of the devil and all his little helpers) But you've got it and are stuck with it. DONT PANIC CH off is not required You need HW on HW off CH on Line Neutral Earth Best option is to find the Wiring centre/joint box and get rid of the room stat by joining out the L and Switched L and remove the neutral That way you can remove the now redundant room stat OR leave stat in place, don't touch Wiring centre, join heating call and switch wire together in the room stat and leave it. Most likely red and yellow BUt look in the stat manual to confirm. If it bursts into flames it ain't my issue as I'm not there😉😂 [/QUOTE]
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Honeywell st9400c to Hive v3 smart
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