Safety: Turn off power to the HVAC system before removing the thermostat.

Step 1 – Reboot: Remove the thermostat from the wall for 30–60 seconds, then reinstall. If the model has a reset button, press it according to the manual.
Step 2 – Check for physical damage: Inspect the screen for cracks or signs of impact. If damaged, the display assembly must be replaced.
Step 3 – Firmware recovery (if supported): Some models allow firmware reload via USB/SD. Follow Trane’s instructions to reinstall firmware.
Step 4 – Replace thermostat: If the touchscreen remains unresponsive and E50 persists, replace the thermostat.

Thermostat displays E50 and touchscreen is unresponsive or frozen

Possible Causes