E15
Lux Touchscreen Calibration or Hardware Fault

Thermostat displays E15 and touchscreen does not respond reliably

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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

Static discharge damage to touch panel, Loose ribbon cable between LCD and main PCB, Firmware glitch affecting touch controller

How to Fix / Troubleshooting

Safety: Turn off HVAC power before removing the thermostat. Do not open the thermostat housing beyond the user-removable front cover.

  • Power cycle: Remove the thermostat from the wall plate for 2–3 minutes, then reinstall and restore power.
  • Clean screen: Wipe the touchscreen gently with a soft, dry microfiber cloth to remove oils and debris.
  • Recalibrate (if available): Some Lux models offer a touchscreen calibration option in the settings menu; run this procedure if accessible.
  • Firmware update: Use the Lux app to check for and install any available firmware updates.
  • Replace thermostat: If E15 persists and the screen remains unresponsive or erratic, the touch panel or its controller is likely damaged and the thermostat should be replaced.
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Repair Difficulty

Medium 3/5

Required Part

Lux Smart Thermostat Touchscreen Assembly
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