Display shows 'noC' or 'no Conn' and thermostat cannot be controlled from the app or gateway.

Safety: No mains work is required for RF pairing.

• Check gateway status: Ensure the Eurotronic gateway or central controller is powered, connected to the router, and shows normal status LEDs.
• Check app: Open the Eurotronic app and verify that the thermostat still appears in the device list and is assigned to the correct room.
• Re-pair device: Put the thermostat into pairing mode and follow the app instructions to add it again. Confirm that 'noC' disappears.
• Reduce interference: Move the gateway to a more central location, away from thick walls and metal objects.
• Replace RF module/gateway: If other devices connect but this thermostat does not, its RF module may be faulty. If no devices connect, the gateway may need replacement.