E16
Lux
Display Power or Backlight Driver Fault
Thermostat displays E16 and backlight or display fails intermittently
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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
Failed LED backlight driver on main PCB, Loose display connector, Overheating of display module
How to Fix / Troubleshooting
Safety: Turn off HVAC power before removing the thermostat from the wall.
- Remove and reseat: Pull the thermostat off the wall plate and reinstall it firmly to ensure good contact with the power pins.
- Check environment: Ensure the thermostat is not installed in direct sunlight or above a heat source that could cause overheating.
- Power cycle: Leave the thermostat unpowered for several minutes, then restore power and observe the display.
- Replace thermostat: If E16 persists and the display remains dim or intermittent, the internal display/backlight circuitry has likely failed and the thermostat should be replaced.
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Repair Difficulty
Medium
3/5
Required Part
Lux Smart Thermostat Display Module
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