The latest firmware release introduced a default maximum temperature setting of 194°F (90°C) for safety reasons. While you can set a higher temperature (up to 230°F) in the app, the sauna will only heat to the default limit unless adjusted manually on the HUUM UKU controller.

How to adjust the maximum temperature on the HUUM UKU controller.

1. Access the Main Menu
   1. Press and hold the UKU controller for 5 seconds until the main menu appears. 
2. Navigate to Heating Settings
   1. Use the controls to select Heating Settings
   2. Set your desired maximum temperature (up to 230°F).
3. Save and Exit
   1. Press the back button to return to the main menu
   2. Confirm 4 precautionary warnings to finalize the change. 
4. Verify the Change
   1. Once completed, your sauna's maximum temperature should now reflect your updated setting.