Viessmann GC1 - Controls Locked Out Is Displayed at the Vitotronic 300-K

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Cause Remedy
This function is disabled. Your heating contractor can lift this
block.
"External hook-up" is displayed at the Vitotronic 300-K
Cause Remedy
The heating program selected at the con-
trol unit was changed over by an external
switching device.
No remedy is required.
"Central control" is displayed at the Vitotronic 300-K
Cause Remedy
The settings of the heating and holiday
programs will be adopted from the heat-
ing circuit for which "Central control" has
been selected.
—
"External program" is displayed at the Vitotronic 300-K
Cause Remedy
The heating program set at the control
unit was changed over by the Vitocom
communication interface.
You can change the heating program.
What to do if...
"Controls locked out" is displayed at the Vitotronic 300-K
5592 675 GB