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Ok excellent thank you so much I appreciate the help from you and everyone else I’ll update if I need anymore help lol

New programmer is Drayton LP522 I believe

Based on how it’s previously wired number 3 and number 8 cores may not be hot water and heating?

I went by the diagram at the bottom so I guess that’s correct for a programmer that controls heating and hot water but when you leave hot water off and just turn on heating the oil boiler wont fire but other way round and it does fire so I’m confused

the oil boiler only fires for CH when HW is on if you go by the instructions for new programmer

Hi How would you wire this new programer to the old wiring for an oil boiler Terminals don’t match up