My Nest Thermostat E turns on preheating in the middle of the night even if I have Max Duration set to 0 in True Radiant. It was working fine until 2 days ago. Is there any feature overriding this setting? I would like to have preheating on during daytime but completely off during night time.
Thanks for reaching out. Please make sure that the Home/Away Assist and Auto schedule features are off. Those are the smart features that might affect the behavior of the Thermostat. Once they're disabled try to monitor if the issue persists. You can check this link for more information.
Keep me posted.