Thermostat shows E13 and cannot connect to the Geo cloud service; remote control via app fails while local control works.

Safety first: No high‑voltage work is required for this issue.

• Step 1 – Check Geo service status: Verify via Geo's website or support channels whether there is a known cloud outage.
• Step 2 – Confirm internet access: Ensure your home internet is working by testing other devices on the same network.
• Step 3 – Router settings: Disable any strict firewall rules, parental controls, or DNS filtering that may block the thermostat. Ensure outbound HTTPS (port 443) is allowed.
• Step 4 – Sync time/date: In the thermostat settings, confirm the time and date are correct. If not, correct them or enable automatic time sync.
• Step 5 – Update firmware: If possible, update the thermostat firmware to the latest version via local update or USB (if supported) following Geo's instructions.
• Step 6 – Re‑add device in app: Remove the thermostat from your Geo account in the app, then re‑add it using the pairing process.
• Step 7 – Contact Geo support: If E13 persists, contact Geo support with logs or diagnostics from the app; a backend account issue may need to be resolved.