Thermostat Wi‑Fi setup fails repeatedly; device never appears in Atlantic app.

Safety first: No electrical disassembly is needed.

• Step 1 – Use 2.4 GHz: Ensure your router broadcasts a 2.4 GHz network; many Atlantic smart thermostats do not support 5 GHz.
• Step 2 – Simplify SSID: Temporarily unhide the SSID and remove special characters from the network name and password.
• Step 3 – Move closer: During setup, bring your phone close to the thermostat and ensure the thermostat has at least medium Wi‑Fi signal strength.
• Step 4 – Disable isolation: Turn off client isolation or AP isolation on the router so the phone and thermostat can communicate.
• Step 5 – Reset network settings: On the thermostat, reset Wi‑Fi/network settings and restart the pairing process from the Atlantic app.