Alexa learns the more it is used and is always improving its natural voice recognition. Ease of use will improve over time, however some utterances and commands may need to be in a specific format for Alexa to recognise them.

For example, instead of asking "Alexa, turn on oscillation mode.", try asking "Alexa, turn on oscillation.".

This approach can work with other commands as well. Instead of "Alexa, turn on heating mode.", you can ask "Alexa, turn heat on.".