How do I access the installer setup (ISU) on my TH4210D, TH4110D, TH4110B thermostat?
- To begin, press and hold the up and down buttons until the display changes.
- Press down to change settings.
- Press up to advance to next function.
- Press and hold down and up to exit and save settings.
For more information on the ISU, please see pages 5 and 6 in the manual. Click here to download (English)