Viessmann Vitodens 200-W System, Operating Instructions For The System User

Page: 49 / 72

49
Cause Remedy
The heat generator is switched off.
■
Turn on the ON/OFF switch: See page 47.
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Switch ON the power supply to your system, e.g. at a
separate MCB/fuse or mains isolator.
■
Incorrect control unit settings.
■
The remote control (if installed) or the room tempera-
ture controller (if installed) is set incorrectly.
Operating instructions, for the remote control
unit or room temperature controller
Central heating must be enabled.
Check the settings and correct if required:
■
Operating program: See page 16.
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Room temperature/flow temperature: See page 25.
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Time: See page 34.
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Time program for central heating: See page 21.
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Only for weather-compensated operation:
Heating curve: See page 26.
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Only for weather-compensated or constant operation:
"Holiday" is switched on: See page 29.
The DHW cylinder is being heated. Wait until the DHW cylinder has been heated up.
Reduce the DHW draw-off rate or temporarily reduce
the set DHW temperature as required.
No fuel. Open the gas shut-off valve. If necessary, check with
your gas supply utility.
"Burner fault" is displayed. Reset the burner: See page 43.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner several times in quick
succession. Immediately notify your contractor if
a burner fault occurs. Your contractor will be able
to analyse the cause and rectify the fault.
"Error message" is displayed. Check what type of fault it is. Make a note of the fault
message and acknowledge the fault: See page 42. If
necessary, notify your contractor.
"Screed drying" is switched on. No action required.
After expiry of the screed drying time, the selected op-
erating program is switched on.
What to do if...
Rooms are too cold
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