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help with my horstmann 425 diadem
- Thread starter DDawson
- Start date
this http://www.horstmann.co.uk/downloads/ElectronicDocuments/Central-Heating/425-InstallationGuide.pdf should take you to your old prog wiring, obviously the new one will have inst with it. If you can't work it out from the diagrams I feel you may not be competent to do the job, so, for safety's sake get a pro in.
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