There is a list of commands at that link. You must have the ecobee plus skill enabled on alexa to do this. If you don't simply ask Alexa:
"Alexa, enable ecobee plus skill"
Alternatively, you can turn on the fan from the thermostat itself. It's nested under settings and "test equipment" This is why I suggested to just ask Alexa.
Link to the skill.
Would be useful to put that in the post, /u/Mikey-A-.
If you have ecobee4 you can simply ask Alexa:
"Alexa, ask ecobee to turn fan on" (Remember to have her turn the fan off too! )
"Alexa, ask ecobee to turn fan off"
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If Alexa doesn't follow those commands make sure your ecobee is named "ecobee". You can check and change this in the Alexa app on your phone.
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https://www.amazon.com/ecobee-Inc-plus/dp/B071672K2R
There is a list of commands at that link. You must have the ecobee plus skill enabled on alexa to do this. If you don't simply ask Alexa:
"Alexa, enable ecobee plus skill"
Alternatively, you can turn on the fan from the thermostat itself. It's nested under settings and "test equipment" This is why I suggested to just ask Alexa.