tado° Smart Thermostat V3+ is offline: what to do

The thermostat used to work but now shows as 'offline' in the app.

We could not fully consult the manufacturer's support page for this model; the steps are general and may differ in details.

Most likely causes

usually this

Router or internet outage

Check if other devices have internet access (phone or laptop).
Restart your router by unplugging it for 30 seconds and plugging it back in.
Wait 2–3 minutes and check the tado° app for the thermostat status.

common

Thermostat out of Wi‑Fi range (2.4 GHz)

Take your phone to the thermostat location and check if you get 2.4 GHz Wi‑Fi there.
Move the router closer or add a Wi‑Fi extender/mesh node on the 2.4 GHz band.
If connectivity improves, reposition devices or add an access point.

sometimes

tado° cloud or app service issue

Check tado° service status online or on social channels for known outages.
Log out and back into the tado° app to refresh the connection.
Wait 15 minutes to see if the thermostat reconnects.

Factory reset

Warning: a factory reset erases all thermostat settings, Wi‑Fi connections and any links in the tado° app. You will need to re-add the device afterwards.

Ensure the thermostat is powered and the screen is active.
Use the thermostat menu to find 'reset' or 'factory reset' if available, or use the tado° app's device settings to initiate a reset.
If no menu option is available, power-cycle the thermostat following the installation guide and check whether a reset option appears after restart.
After reset, open the tado° app and add the thermostat again using the standard setup procedure.

Frequently asked

Why does the app keep asking for my Wi‑Fi password?

The app needs your Wi‑Fi details to connect the thermostat; enter the password only into the tado° app.

Does the thermostat use 5 GHz Wi‑Fi?

tado° typically uses the 2.4 GHz band for local connectivity; use 2.4 GHz during installation.

Will I lose schedules after a reset?

Yes, a factory reset removes local settings; you'll need to set up schedules again in the app.

Can I link the thermostat to Google Home or Alexa?

Yes — link your tado° account to Google Home, Alexa or Apple Home via their respective apps.