Viessmann VITOTRONIC 200, Operating Instructions Manual

Page: 44 / 72

44
Cause Remedy
"External hook-up" enabled. No action required.
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.
This function cannot be influenced via the control unit.
Once the external changeover no longer applies, the
set operating program becomes active again.
"External program" enabled. The operating program set at the control unit has been
changed by another control device.
You can change the operating program on the
Vitotronic control unit.
Rooms are too hot
Cause Remedy
■
Control unit incorrectly adjusted.
■
The remote control (if installed) is set incorrectly.
Separate operating instructions
Check the settings and correct if required:
■
Operating program (see page 17)
■
Room temperature (see page 22)
■
Time (see page 31)
■
Time program, central heating (see page 23)
■
Heating curve (see page 23)
"Fault" is displayed. Check what type of fault it is. Acknowledge the fault
(see page 38). If necessary, notify your contractor.
The mixer motor is faulty. Notify your heating contractor.
"External hook-up" enabled. No action required.
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.
This function cannot be influenced via the control unit.
Once the external changeover no longer applies, the
set operating program becomes active again.
"External program" enabled. The operating program set at the control unit has been
changed by another control device.
You can change the operating program on the
Vitotronic control unit.
What to do if...
Rooms are too cold
(cont.)
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