FIRMWARE_UPDATE_FAILED
Netatmo Firmware Update Interruption

App reports that the thermostat or Relay firmware update failed; device may reboot repeatedly or lose connection during updates.

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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

Unstable Wi‑Fi during update, Power loss to Relay during firmware download, Insufficient free memory due to corrupted firmware image, Cloud communication timeout

How to Fix / Troubleshooting

Important: Do not repeatedly unplug the Relay during an update unless it is clearly stuck for more than 20–30 minutes.

  • Stabilize network: Ensure the router is powered, close to the Relay, and not overloaded. Avoid streaming or heavy downloads during the update.
  • Retry update: In the Netatmo Energy app, go to Settings > Manage my home > Relay/Thermostat > Firmware and trigger the update again if available.
  • Power‑cycle once: If the device is stuck for more than 30 minutes, unplug the Relay for 30 seconds and plug it back in. Wait for it to reconnect and then check firmware status.
  • Check router firewall: Ensure outbound HTTPS traffic is allowed and that no security appliance is blocking Netatmo update servers.

If the device never completes updates and remains unstable, its flash memory may be damaged; replacement of the Relay or thermostat is recommended.

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Repair Difficulty

Medium 3/5

Required Part

Netatmo Relay Module
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