Thema "Lost Connection to Vitoconnect 100 OPTO1" in The Viessmann API

Lost Connection to Vitoconnect 100 OPTO1

Mayone — Mon, 30 Mar 2026 13:42:51 GMT

Good morning, for a few days now I've been unable to contact the Vitoconnect 100 OPTO1 module, either via the ViCare app or via HomeAssistant. I checked and the module is correctly connected to the network, and I see that the firewall sees requests to the Viessmann cloud, but nothing appears on the app or HomeAssistant. I've already tried disabling and reactivating the Wi-Fi network, but to no avail. Can you give me any suggestions? Thanks!

Betreff: Lost Connection to Vitoconnect 100 OPTO1

knif01 — Thu, 09 Apr 2026 16:03:27 GMT

please try to power off and power on the Vitoconnect modul, for me its solved connection problems

Betreff: Lost Connection to Vitoconnect 100 OPTO1

Mayone — Fri, 10 Apr 2026 04:13:27 GMT

In your opinion, why did I take a remote management module? Maybe because the installation is 300 km away? Unable to disconnect power.

Re: Lost Connection to Vitoconnect 100 OPTO1

Mayone — Tue, 28 Apr 2026 04:33:40 GMT

I managed to send someone home to restart the module and it worked for a week. Yesterday, in conjunction with the update of the app on the phone, it stopped working again. Obviously the module is connected and detected by the dhcp server. Worse and worse.