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"No connection to internet"
Cause Remedy
No WiFi connection Check the network settings during WiFi commission-
ing.
Check that your Viessmann appliance is connected to
the WiFi.
WiFi signal strength insufficient Check the WiFi signal strength in the "Device info"
menu of your Vitotrol 300-E: See page 48.
If necessary, move the Vitotrol 300-E to a different in-
stallation location: See page 12.
Use a WiFi repeater if necessary.
WiFi connection established but no internet connection. Check the internet connection with other subscribers,
e.g. a laptop. If no internet connection is possible
even with another subscriber, have the network set-
tings checked by an IT expert.
Restart the Vitotrol 300-E: See page 53.
The Vitotrol 300-E and the Viessmann appliance are in
different networks.
Check the network settings during WiFi commissioning.
The WiFi on the Viessmann appliance is deactivated. Activate the WiFi on your Viessmann appliance.
Operating instructions for the Viessmann appli-
ance
The connection to the Viessmann server is interrupted
"No connection to router"
Cause Remedy
No WiFi connection Check the network settings during WiFi commission-
ing.
Check that your Viessmann appliance is connected to
the WiFi.
WiFi signal strength insufficient Check the WiFi signal strength in the "Device info"
menu of your Vitotrol 300-E: See page 48.
If necessary, move the Vitotrol 300-E to a different in-
stallation location: See page 12.
Use a WiFi repeater if necessary.
The WiFi router was replaced. Connect your Viessmann appliance to the new WiFi
router.
Operating instructions for the Viessmann appli-
ance
What to do if...
Internet connection is interrupted
5839615
Diagnosis
51


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Viessmann Vitotrol 300-E User Manual - German - 64 pages

Viessmann Vitotrol 300-E User Manual - Dutch - 64 pages


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