New to Tado - I have cast iron rads and never once has my tado hit its target heat.

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Can anybody explain what I’m doing wrong? I’ve put the thermostat in my son’s room as he has a monitor in there with the temperature on too so that I can check. I’ve set it to be 21 degrees and the tado and his monitor say 19. It’s been this way for 24hours, never reaching its set temperature.

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