Rooms Are Too Cold; Rooms Are Too Hot - Viessmann Vitodens 100-W Operating Instructions Manual

Rooms are too cold

Cause
The heating system is off.
Control unit or room temperature controller is not set
correctly.
Only when operating with DHW heating:
DHW heating priority is active (" " is displayed).
No fuel.
" " is shown on the display.
" " and the fault code flash on the display. The burner
does not start.
Air in the heating system.
The burner is switched off. Blockage in the ventilation
air supply or flue system.
The "holiday program" function is switched on via the
ViCare app.
"E " is shown on the display.
e

Rooms are too hot

Cause
Control unit or room temperature controller is not set
correctly.
" " is shown on the display.
The "holiday at home" function is switched on via the
ViCare app.
"E " is shown on the display.
e
Remedy
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).
Operation with room temperature controller:
■
Set a higher flow temperature.
Weather-compensated operation:
■
Set a higher room temperature.
Wait until the DHW cylinder has been heated up (" "
disappears).
In the case of operation with an instantaneous water
heater, stop DHW draw-off.
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.
Notify your heating contractor of the fault code shown.
Reset the burner: See page 30.
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.
Bleed radiators.
Notify your local heating contractor.
Use the ViCare app to check whether the "holiday pro-
gram" function is switched on, change it if necessary, or
switch it off.
Remedy
Check and correct the room temperature or flow tem-
perature.
Operating instructions for room temperature con-
troller
Notify your heating contractor of the fault code.
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...
33