This type of zone can only use a measured temperature from a device assigned to it, it will not take the temperature from My House or the Weather data. To fix the solution, a valid measured temperature must be assigned.
The 2 main reasons why a valid measured temperature isn't being provided are:
1. A suitable device (such as a Room Sensor or Thermostat) has not been assigned
2. The temperature measuring device in the zone has developed a fault, such as low batteries or cannot communicate with the Genius Hub