E06 displayed and thermostat cannot connect to the Delta Dore smart gateway (Tydom) or cloud services; app control fails.

Safety first: Network troubleshooting is low risk, but do not open mains-powered devices unless power is isolated.

• Check Tydom gateway status: Verify that the Tydom or Delta Dore smart gateway LEDs indicate normal operation (steady power, active network). If LEDs show fault, power cycle the gateway.
• Verify internet connection: Confirm that your router has internet access by testing another device. If the router is offline, restore internet first.
• Reboot thermostat: Power cycle the thermostat (remove batteries or switch off the circuit for 1–2 minutes). After restart, wait a few minutes to see if E06 clears.
• Re-pair with Tydom: In the Tydom app, go to Settings > Add device and follow the instructions to add or re-add the Delta Dore thermostat. On the thermostat, enter pairing mode via Menu > Connectivity > Pairing.
• Update firmware: If available, update the Tydom gateway firmware via the app. Some E06 issues are resolved by firmware updates.

If E06 persists and other devices connect fine to Tydom, the thermostat’s radio/IP module may be defective and require replacement.