"External Program" Is Displayed - Viessmann Vitotronic 200 Operating Instructions For The System User

"Power-OFF C5" is displayed
Cause
This message is displayed whilst the
power supply is blocked by the power
supply utility.

"External program" is displayed

Cause
The operating program set at the heat
pump control unit was changed over by
the Vitocom 100 communication inter-
face.
Remedy
No measures required.
The heat pump restarts automatically with
the selected operating program as soon
as the power supply utility restores the
power supply.
Remedy
You can change the operating program.
Follow the instructions in the menu.
What to do if...
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