TIME_SYNC_ERROR
Netatmo NTP Time Synchronization Failure

The thermostat or app shows an incorrect time or a time synchronization error; schedules trigger at the wrong times.

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Possible Causes

Relay cannot reach time servers due to a firewall or no internet, Wrong time zone set in the app, Router blocking NTP traffic, Temporary Netatmo server issue

How to Fix / Troubleshooting

Note: Time is managed via the Relay and cloud; the thermostat itself does not keep precise time long-term.

  • Verify internet: Ensure the Relay has internet access by checking for 'NO_INTERNET' or 'NO_WIFI' errors and resolving them.
  • Check time zone: In the Netatmo Energy app, confirm your home’s time zone and daylight saving settings are correct.
  • Router settings: Ensure your router does not block NTP or outbound UDP traffic required for time synchronization.
  • Reboot Relay: Power-cycle the Relay to force a new time sync attempt.

If the time remains incorrect despite a working internet connection and correct time zone, contact Netatmo support; a backend issue may be present.

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Repair Difficulty

Very Easy 1/5

Required Part

Netatmo Relay Module
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