34
"No connection to internet"
Cause Remedy
No WiFi connection
■
Check the network settings during WiFi commission-
ing.
■
Check whether your heat generator 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 31.
■
If required, 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 36.
The Vitotrol 300-E and the heat generator are in differ-
ent networks.
Check the network settings during WiFi commissioning.
The WiFi on the heat generator is deactivated. Activate the WiFi on the control unit of your heat gener-
ator.
Heat generator operating instructions
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 whether your heat generator 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 31.
■
If required, 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 heat generator to the new WiFi router.
Heat generator operating instructions
What to do if...
Internet connection is interrupted
5839615
Diagnosis
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