Thermostat frequently loses connection to the app but still controls heating locally

Safety: No mains work is required.

Steps:

• Check Wi-Fi signal strength at the thermostat location using a smartphone. If weak, move the router or add a Wi-Fi extender.
• Disable aggressive power-saving or "Wi-Fi eco" modes on the router that may disconnect idle devices.
• Update the thermostat firmware and mobile app to the latest versions.
• Assign a fixed IP address (DHCP reservation) to the thermostat in the router settings to reduce reconnection issues.

Remedy:

• If connectivity remains unstable while other devices are fine, the thermostat’s Wi-Fi module may be marginal. Replacement of the thermostat or internet gateway may be required.