Video doorbell no longer connected

[Hatsumi]

My video doorbell has stopped working after a power cut in the electricity.

I had it professionally installed and it was working perfectly until yesterday. 

Please can someone advise on a solution?

[jguerdat]

I've had a couple of power outages recently and the doorbell came back on by itself. Do you see any activity from the ring around the doorbell as well as the small red LED at night? Is the doorbell connected to your WiFi or a base station? Have you power cycled the doorbell by turning the circuit breaker off and on? If connected to your WiFi, it might be worth rebooting the router.