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Just discovered that the installer may have incorrectly marked the Three Core and Earth cables! :x We think it should be: Red : HW Off Yellow : HW On Blue : CH On

I'm not sure if this should be posted here or into the Electrics section - but I'll try here first! Hope someone can help me on this!! As part of a kitchen refurb, my old Appollo boiler with mechanical time clock had gone well past its date. We’ve replaced the boiler with a Halstead Hero...