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

What to do if...

Rooms are too cold

Cause
The heating system is off.
Control unit or room temperature control
unit 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.
24
Remedy
■ Switch the 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:
■ " " has to be adjusted (see
page 12)
■ Room temperature or boiler water tem-
perature (see page 12)
■ Time program
Room temperature control unit
operating instructions
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 20).
Notify your heating contractor of the fault
code if the fault reoccurs.
Notify your heating contractor of the fault
code.
Acknowledge the fault message with OK
(see page 20).
" symbol extinguishes).