Rooms Are Too Cold - Viessmann Vitotronic 200 Operating Instructions Manual

What to do if...

Rooms are too cold

Cause
The heat pump is off.
Settings made at the heat pump control unit have been
changed or are incorrect.
The DHW cylinder is being heated.
"Note", "Warning" or "Fault" is shown.
"Screed drying" is activated.
In conjunction with a ventilation unit:
Bypass does not close.
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Preheating coil faulty
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Supply air/extract air fan faulty
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58
Remedy
Turn on the ON/OFF switch: see diagrams on
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page 24 onwards.
Switch ON the mains isolator (if installed, outside the
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boiler room).
Set the MCB in the power distribution board (main do-
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mestic MCB).
Central heating/central cooling must be enabled.
Check the following settings and correct if required:
Operating program: see page 33.
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Room temperature: see page 33.
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Time: see page 49.
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Time program for central heating/central cooling: see
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page 27.
Time program for heating water buffer cylinder: see
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page 27.
Heating curve/cooling curve: see page 28.
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If necessary, enable the electric booster heater for
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central heating (if installed): see page 37.
Wait until the DHW cylinder has been heated up.
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Reduce the DHW draw-off rate or temporarily reduce
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the standard DHW temperature as required.
Check what type of message it is. Acknowledge the
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message: see page 54.
If necessary, notify your contractor.
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No action required.
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As soon as the period for screed drying has expired,
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the heat pump continues in the selected operating
program: see page 26.
Notify your contractor.