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What I didn’t try yet was unplugging the room starts completely from the wiring centre. I’m not sure if them being plugged in is somehow creating an override from what the ESi or Wiser programmer says. It seems like the programmer heating zone schedules get ignored, as when you turn the room...

Hi, I've got a new-build house from 2018 that has an S-plan system with 2 heating zones and separate hot water. From new: - The gas boiler is an Ideal Logic Heat H15 - The programmer is an ESi ES3247B, which is on the wall close to the gas boiler - Both upstairs and downstairs there is an ESi...