Rooms Are Too Cold; Rooms Are Too Hot; There Is No Hot Water - Viessmann Vitocrossal 100 Operating Instructions Manual

What to do if...

Rooms are too cold

Cause
The heating system is switched off.
Control unit or room temperature controller incorrectly
adjusted.
Only when operating with DHW heating:
DHW priority is enabled ("
No fuel.
" " is shown on the display.
" " is shown on the display.

Rooms are too hot

Cause
Control unit or room temperature controller incorrectly
set.
" " is shown on the display.

There is no hot water

Cause
The heating system is off.
Control unit incorrectly set.
20
" is displayed).
Remedy
■ Turn on the ON/OFF switch " " (see page 10).
Switch ON the mains isolator if installed (outside the
■
boiler room).
Set the MCB in the power distribution board (main do-
■
mestic MCB).
Check the settings and correct if required:
" " must be set (see page 12)
■
Room temperature or boiler water temperature (see
■
page 12)
Time program
■
Room temperature controller operating instruc-
tions
Wait until the DHW cylinder has been heated up ("
disappears).
In the case of operation with an instantaneous water
heater, stop DHW draw-off.
For operation with LPG:
Check the fuel reserves and re-order if required.
For operation with natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
Press "R" (see page 10).
Acknowledge the fault message with OK (see page 17).
Notify your heating contractor of the fault code if the
fault reoccurs.
Notify your heating contractor of the fault code shown.
Acknowledge the fault message with OK (see page 17).
Remedy
Check the settings and correct if required:
Room temperature or boiler water temperature (see
■
page 12)
Time program
■
Room temperature controller operating instruc-
tions
Inform your heating contractor of the fault code.
Acknowledge the fault message with OK (see page 17).
Remedy
■ Turn on the ON/OFF switch " " (see page 10).
Switch ON the mains isolator if installed (outside the
■
boiler room).
Set the MCB in the power distribution board (main do-
■
mestic MCB).
Check the settings and correct if required:
DHW heating must be enabled (see page 13).
■
DHW temperature (see page 13).
■
"