DIAGNOSIS The capacitive touch layer has locked up, usually from a software glitch or static discharge. The screen is on, but it doesn't register input.
FIX Force a reboot.
- Pull the thermostat display straight off its wall plate.
- Wait 30 seconds.
- Plug it back in. You'll see it reboot. This clears the touchscreen controller's memory.
IF THAT DIDN'T WORK Perform a full factory reset from the physical buttons.
- Pull the display off.
- Press and hold the physical button on the BACK of the display for about 15 seconds until all LEDs flash.
- Release and reattach. You'll have to set it up again like new.
HEADS UP Don't use glass cleaner or any liquid directly on the screen. A microfiber cloth only. Chemicals can damage the oleophobic coating and make the touchscreen behave erratically.