Hello, this is a recurring issue, first reported in March 2026 here: https://community.viessmann.de/t5/The-Viessmann-API/Lost-Connection-to-Vitoconnect-100-OPTO1/m-p/614724 My Vitoconnect 100 (type OPTO1) shows as offline in the ViCare app again. Device Vitoconnect 100, type OPTO1 Control unit: V200KO2B Vitoconnect ID: available via private message What I have verified on the network side Connected to 2.4 GHz Wi-Fi with good signal (-57 dBm), directly to the main access point Valid IPv4 address via DHCP, reachable via ping Firewall shows no blocked traffic; ports 443 and 123 are open The module regularly contacts mgmt.viessmann-platform.io (about every 30 minutes) and NTP servers However, there is no traffic at all to the Viessmann data servers So the module is online and reaches your management backend, but it never seems to upload boiler data. The cable between the Vitoconnect and the boiler is in good condition and properly connected. Since this keeps happening, could a Customer Care agent please check on your side: whether the gateway is seen as connected whether it is receiving data from the boiler whether its firmware is up to date I am currently not on site, so a remote check would help me understand whether a power cycle is needed or whether something must be fixed on your side. Thank you!
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