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Viessmann Vitodens 222-W - 2023 Manual

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Cause Remedy
The heat generator is switched off. ■Turn on the ON/OFF switch: See page 49.
■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 19.
■Room temperature/flow temperature: See page 28.
■Time: See page 38.
■Time program for central heating: See page 29.
■Only for weather-compensated mode:
Heating curve: See page 29.
■Only for weather-compensated mode or continuous
operation:
The holiday program is switched on: See page 32.
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 if necessary.
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 45.
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.
"Fault" is displayed. Check what type of fault it is. Make a note of the fault
message and acknowledge the fault: See page 45. You
may have to 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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