Set Appliance State:

WARNING! - Mains voltage is expected during test follow
TOPs P4 live testing procedure
Mains Power On

Observation:

Check the settings for the outdoor sensor to see if it is enabled
(on means the outdoor sensor is enabled).
Enter the service/installer mode by pressing and holding the tap and radiator buttons simultaneously for 3 seconds.
Then select "Settings" > "Heating curve" > "Enable"
Is the outdoor sensor enabled in the settings?