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Viessmann VITODENS 100-W - 2023 Manual

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33
Cause Remedy
The heating system is off. ■Turn on the ON/OFF switch.
■Switch ON the mains isolator if installed (outside the
boiler room).
■Reset the MCB in the power distribution board (main
domestic MCB).
Control unit or room temperature controller is not set
correctly.
■Operation with room temperature controller:
Set a higher flow temperature.
■Weather-compensated operation:
Set a higher room temperature.
Only when operating with DHW heating:
Priority for DHW heating is active (" " is displayed).
Wait until the DHW cylinder has been heated up (" "
disappears).
In the case of operation with an instantaneous water
heater, stop DHW draw-off.
No fuel. With LPG:
Check the fuel reserves and re-order if required.
With natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
" " is shown on the display. Notify your heating contractor of the fault code shown.
" " and the fault code flash on the display. The burner
does not start.
Reset the burner.
Notify your heating contractor if the fault recurs.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not reset the burner several times in quick
succession. Notify your heating contractor if a
fault recurs. Your heating contractor will be able
to analyse the cause and rectify the fault.
Air in the heating system Bleed radiators.
The burner is switched off. Blockage in the ventilation
air supply or flue system
Notify your local heating contractor.
The "holiday program" function is switched on via the
ViCare app.
"E 3" is shown on the display.
Use the ViCare app to check whether the "holiday pro-
gram" function is switched on, change it if necessary, or
switch it off.
Rooms are too hot
Cause Remedy
Control unit or room temperature controller is not set
correctly.
Check and correct the room temperature or flow tem-
perature.
Operating instructions for room temperature con-
troller
" " is shown on the display. Notify your heating contractor of the fault code.
The "holiday at home" function is switched on via the
ViCare app.
"E 3" is shown on the display.
Use the ViCare app to check whether the "holiday at
home" function is switched on, change it if necessary,
or switch it off.
What to do if...
Rooms are too cold
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