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Replacing horstmann 425 coronet central heating only

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28 Sep 2024
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What central heating programmer can be replace the 425 coronet with onto existing back plate without rewiring. Thank you
 

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I believe the Horstmann/Secure ChannelPlus H17XL would fit on the existing backplate, without any wiring changes...


Although, could we have a photo of your backplate to confirm (isolating the power safely before removing it)?
looking at instructions it looks same back plate
 

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