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If your pump is still set to 400mb you might take a few readings, with boiler running steadily, important ones for now are the pump speed% and boiler modulation% + any other readings you care to add....,.then change the hydraulic settings so that the pump is running at 100% like in post #38 and...

Are you getting the S53 alarm? also with CH ON check D.005 and see what it's reading is.