What To Do If; Rooms Are Too Cold - Viessmann VITODENS Series Operating Instructions Manual

What to do if...

Rooms are too cold

Cause
The heating system is switched off.
Control unit or room temperature control-
ler incorrectly adjusted.
Only when operating with DHW heating:
DHW priority is enabled ("
played).
No fuel.
Symbol " " is shown on the display.
Symbol " " is shown on the display.
28
Remedy
■ Switch ON/OFF switch " " ON (see
figure on page 10).
■ Switch ON the mains isolator, if instal-
led (outside the boiler room).
■ Reset the MCB in the power distribution
board (main domestic MCB).
Check settings and correct if required:
■ "
page 12)
■ Heating flow temperature (see
page 12)
or
Room temperature (see room temper-
ature controller operating instructions)
■ Time (see page 20 and room tempera-
ture controller operating instructions)
■ Time program (see page 13 and room
temperature controller operating in-
structions)
Wait until the DHW cylinder has been
" is dis- heated up ("
In the case of operation with an instanta-
neous 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.
Press "R" (see diagram on page 10).
Acknowledge the fault message with OK
(see page 25).
Notify your heating contractor of the fault
code if the fault reoccurs.
Notify your heating contractor of the fault
code displayed.
Acknowledge the fault message with OK
(see page 25).
" has to be adjusted (see
" symbol extinguishes).