True radiant issue

[thegios]

I am not sure if Trye radiant is working as expected.

This is my daily schedule (PS: learning is turned off, but btrue radiant is turned on).

00:00 > ECO

07:00 > 20.0 Celsius

17:00 > 20.5 Celsius

20:00 > 21.0 Celsius

22:00 > ECO

My expectations:

A- heating turns on at 07:00 minus Xh, where Xh is the time it takes for the house to go from 19 Celsius (the temp I usually have in house at night) to 20.00 Clesius
B- Between 07:00 and 17:00 minus Yh the heating sometimes turns on to keep the house at 20.0 Celsius but for sure Yh before 17:00 the heating must turn on to make sure the house is at 20.5 Celsius by 17:00.
C- Between 17:00 and 20:00 minus Zh the heating sometimes turns on to keep the house at 20.5 Celsius but for sure Zh before 20:00 the heating must turn on to make sure the house is at 21.0 Celsius by 20:00.
D- Between 20:00 and 22:00 the heating sometimes turns on to keep the house at 21.0 Celsius but for sure at 22:00 goes in ECO.

Now, while A and D happen, B and C do not work as expevcted, because
- at 16:45 thermostat still display 20.0 Celsius (instead of being on to bring house to 20.5 Celsius by 17:00) and at 19:45 still displays 20.5 Celsius (instead of being on to bring house to 21.0 Celsius by 20:00)

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Also, is there a way to have the thermostat unlearn the true radiant curve, since I have changed biler and two radiators are now bigger?

[luciaaa]

Hi, @thegios!

Thank you so much for posting in the community. I’m truly sorry the True Radiant is not working as expected. I’m happy to help you!

To provide you with the best assistance, please let me know your Nest thermostat model.

True Radiant thermostats anticipate your heating needs. They learn how long it takes your radiant heating system to warm your home, turning it on early to reach your target temperature and off before it overshoots. For instance, if the system knows your home heats up slowly, it might turn off at 69°F even if your target is 71°F, as the hot radiators will continue to warm the space. These thermostats also proactively turn the system back on to prevent temperatures from dropping too low.

To help the Nest thermostat learn the heating pattern and a pre-heating pattern again, please:

Reset the Auto-schedule: It will clear your current heating schedule.

Create a new Auto-schedule. 

Disable the True Radiant settings: This will help the thermostat learn your home's heating patterns without the True Radiant feature.

Please let me know how it goes.

Best regards,

Ana