Thermostat shows 'GATEWAY' or similar error; cannot connect to Salus Smart Home system even though Wi-Fi is working.

Safety first: No electrical work is required; changes are via app or web portal.

Steps to check:

• Verify account: Log into the Salus Smart Home app with the correct account that owns the gateway. Ensure the gateway appears online.
• Re-add device: Remove the thermostat from the app, then follow the pairing procedure to add it again to the gateway, scanning any QR code or entering the device ID as required.
• Update gateway firmware: In the app, check for gateway firmware updates and apply them.
• Check maximum devices: Ensure the gateway has not reached its maximum number of paired devices. Remove unused devices if necessary.

Resolution: If the thermostat cannot be associated with any gateway despite correct procedures, the internal Smart Home radio or ID may be faulty. Replace the thermostat.