If you receive this message, the serial number is linked to another account, and you cannot use it until it is removed from the existing account. Here are a few reasons why this might occur:
- You may be trying to register a controller your contractor installed and added to his or her account. Contact your contractor for details on transferring your controller configuration to you.
- The contractor may have used a different email address for your controller or misspelled the email address. Verify with your contractor that the correct email address was used.
- The serial number is already linked to another person. Contact the original owner of the Hydrawise controller to release the serial number using the instructions below.
- You created your account under a different email address.
Remove Serial Number (New App)
![Hydrawise_Linkedtoother account_1](/sites/default/files/styles/paragraph_image_right/public/2024/01/19/Hydrawise_Linkedtoother%20account_1.png?itok=9yACXpzf)
- Open the Hydrawise App.
- Click the (
) icon in the upper left.
- Click Controller Settings.
- Click Serial Number.
- Tap on the (x) icon and Save.
![](/sites/default/files/inline-images/image_166.png)
Remove Serial Number (Old App)
![Hydrawise_Controller Settings_Old_Remove Serial](/sites/default/files/styles/paragraph_image_right/public/2024/05/02/Hydrawise_Controller%20Settings_Old_Remove%20Serial.png?itok=lmX8kiX2)
- Open the old Hydrawise App.
- Click the (
) icon in the upper left.
- Click Controller Settings.
- Click Remove Number.
- Select Ok.
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