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Thanks for that, my initial thought is to go with the relays. Use a 2 Pole AC Contactor, one pole for the live to the pump and the other pole to the boiler, in common with the other zones as you said. The programmer is failing, so needs to go. Cheers

Picture of the programmer. There doesn't appear to be a wiring centre, everything seems to be wired from the programmer. The brown circle is the permanent fused live, neutral and earth. The red circle shows the boiler switched live, neutral and earth. The yellow circle are two terminals...

Trying to identify what type of system I have, any help would be appreciated. I have an oil boiler that has a switched live going from the programmer, its a no name multi-zone programmer that is no longer made. The programmer then has four switched live which all have time zone switching. One...