If your Grainfather GF30, G40 or G70 won't connect to the Grainfather App, or you're seeing messages such as "Verification Failed" etc, work through the checklist below.
1. Check your Wi-Fi network
The controller only supports 2.4 GHz Wi-Fi.
- Make sure your router has 2.4 GHz enabled.
- If your router combines the 2.4 GHz and 5 GHz networks under one name (SSID), you may need to temporarily separate them or enable a dedicated 2.4 GHz network.
- Every router is different, so refer to your router or modem manual if you're unsure how to check.
Note: The controller cannot connect to a 5 GHz-only network.
2. Check IoT compatibility (G40 & G70)
For the G40 and G70, ensure your router allows IoT (Internet of Things) devices.
Some routers have settings that block or isolate smart devices from connecting.
3. Make sure you're within Wi-Fi range
Poor signal strength can prevent the controller from connecting.
Try moving the brewing system closer to your router before attempting to pair again.
4. Clear the saved Wi-Fi credentials
If the controller has previously connected to another network, clearing the stored credentials can help.
On the controller:
Menu>WiFi Config> Clear credentials
Then delete and reinstall the app and try connecting again.
5. Try connecting to a mobile hotspot
This is one of the quickest ways to determine whether the issue is with your home network.
- Turn on the hotspot on your mobile phone (ensuring your phone is not connected to Wifi but using mobile data).
- Connect your Grainfather controller to the hotspot.
- If it connects successfully, the issue is likely related to your home router or network settings rather than the controller.
6. Check your Wi-Fi password
Some routers or devices can have difficulty with certain special characters.
If your Wi-Fi password contains characters such as:
- @_,$,%,&,! etc.
Try temporarily changing your Wi-Fi password to use only letters and numbers, then attempt to connect again.
Still having trouble?
If you've completed all of the steps above and your controller still won't connect, please contact Grainfather Support with:
- Your Grainfather model (GF30, G40 or G70)
- Serial number
- The exact error message you're seeing (if any)
- Whether the controller connected successfully to a mobile hotspot
- Whether you're using a 2.4 GHz Wi-Fi network
- What firmware version your controller is on
- What app version you are using
- Email address used for the app.
Providing this information will help us diagnose the issue as quickly as possible.