"External Hook-Up" Is Displayed; "External Program" Is Displayed - Viessmann VITOTRONIC 100 Operating Instructions Manual
Heating system with control unit for operation with a constant boiler water temperature
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Also See for VITOTRONIC 100:
- Installation and service instructions manual (168 pages) ,
- Operating instructions manual (64 pages) ,
- Operating instructions for the system user (57 pages)
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What to do if...
"External hook-up" is displayed
Cause
The operating program set at the control unit was e.g.
changed over via an externally connected button.
Example: In a school, heating demand exists outside of
school times, e.g. for a parents' evening.
"External program" is displayed
Cause
The operating program set at the control unit has been
changed over by another control device. E.g., by your
mobile phone using your Viessmann app.
30
Remedy
No action required. This function cannot be influenced
via the control unit. Once the external changeover no
longer applies, the set operating program becomes ac-
tive again.
Remedy
You can change the operating program.
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