Lux Timekeeping or NTP Sync Issue

Thermostat fails to update time automatically or shows incorrect time after power interruptions

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Possible Causes

Wi‑Fi not connected to internet, Time zone misconfigured, Internal clock backup failure

How to Fix / Troubleshooting

Safety: No electrical work is required.

  • Verify Wi‑Fi and internet: Ensure the thermostat is connected to Wi‑Fi and that the network has internet access.
  • Set time zone: In the Lux settings, select the correct time zone and enable automatic time sync if available.
  • Manual set: If automatic sync is unavailable, manually set the time and date on the thermostat.
  • Monitor after outage: After the next power interruption, check whether the time remains accurate. If not, the internal clock backup may be failing and the thermostat may need replacement.
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Repair Difficulty

Very Easy 1/5

Required Part

Lux Smart Thermostat Real-Time Clock Circuit
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