Safety: Turn off power at the breaker before removing the thermostat from the wall.

Steps to troubleshoot E11 (UI failure):

1. Clean front panel: Wipe the thermostat screen and buttons with a soft, dry cloth. Do not use liquids or sprays directly on the device. Residue or moisture can interfere with capacitive touch.
2. Power cycle: Turn the breaker OFF for 1 minute, then ON. Check if the UI responds normally after reboot.
3. Check for physical damage: Inspect the front panel for cracks, warping, or signs of impact. If the glass or plastic is damaged, the touch sensor may be compromised.
4. Reseat display connection (advanced): With power OFF and thermostat removed, carefully open the housing (if serviceable) and reseat any ribbon cables between the display/touch panel and the main board.
5. Firmware update: If you can still access the app, check for firmware updates that may address UI issues.
6. Replace thermostat: If E11 persists and the UI remains unresponsive, replace the thermostat. The touch panel and UI controller are typically integrated and not field-repairable.

Note: Avoid pressing the screen with sharp objects; use only a fingertip.

Thermostat displays E11 and buttons or touch interface do not respond correctly

Possible Causes