Requirements: Wi-Fi network, Mobile hotspot.
The router is most likely causing this issue. Please investigate our suggestions below or contact the place you bought your router.
Disconnect a Wi-Fi device and try again. Some routers can only handle a limited number of devices.
Make sure to use a 2.4gHz router.
Make sure that server ports: 9533 and 9534 is open in the router. For information regarding this, contact the manufacturer of the router.
Contact the retailer from whom you have purchased the thermostat.