Some boilers may show an error code once you've wired tado° devices to it. This is usually because these devices are not configured correctly yet.
Please make sure that you've completed every step in the online installation assistant. And wait until you've seen a message confirming that you've finished your installation.
If the installation is completed and the error code does not disappear after a while, please switch the boiler off and on to reset it.
If the error code still appears after this point, please contact our Technical Support Team.