Safety first: No mains work is required.

Steps to check:

Confirm compatibility: Ensure the thermostat model is supported by the specific Salus app and gateway you are using.
Reset device: Perform a factory reset on the thermostat before attempting pairing.
Follow pairing sequence: Put the gateway into pairing mode first, then the thermostat, following the exact timing and button presses in the manual.
Check account and region: Make sure your Salus account region matches the device region and that you are not using a VPN that could interfere.

Resolution: If pairing fails across multiple gateways and networks, the thermostat's Smart Home radio may be defective. Replace the thermostat.

Thermostat cannot be added to the Salus app; pairing fails repeatedly.

Possible Causes