Did you try other command e.g. "OK Google, start watering"? "OK Google, talk to Netro Home". Could your provide us more details. If you are using the Google Home APP, does it work if you click the start button? If you using voice command, any feedback or error messages?
Yes I tried all the voice commands none of them are working. I’m using iOS assistant, home and smart speaker same as my wife on android phone. We do see sprinkler on our home app , We can control it with the play button only for zone number 1. There are no error messages.