Johnson Controls
User Interface Input Failure
Thermostat is unresponsive to touch or button presses, but the display is lit and shows current temperature.
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Locked keypad/child lock enabled, Frozen UI process in firmware, Failed capacitive touch sensor, Loose front bezel connection
How to Fix / Troubleshooting
Safety: No high‑voltage work is required, but turn off HVAC power before removing the thermostat from the wall.
- Step 1 – Check for lock icon: Look for a lock symbol on the display. If present, follow the user manual to unlock (often a long press or PIN entry).
- Step 2 – Reboot: Turn off power to the thermostat at the breaker for 60 seconds, then restore.
- Step 3 – Inspect bezel connection: Remove the thermostat from the sub‑base and ensure the front bezel is fully seated and any ribbon cables are firmly connected.
- Step 4 – App control: Try adjusting settings from the Johnson Controls mobile app. If the app can control the thermostat but the local UI is dead, the touch hardware is likely failed.
- Step 5 – Replace display module: Replace the display/touchscreen assembly or entire thermostat if the UI remains unresponsive.
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Repair Difficulty
Medium
3/5
Required Part
Display and Touchscreen Assembly
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