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

... rooms are too cold?

Cause
The heating system is switched OFF.
The ON/OFF indicator 8 (green) is
OFF.
The control unit or the remote control
unit is incorrectly adjusted.
Only when operating with DHW load-
ing:
DHW priority (wp in the display).
No fuel.
Control unit fault: "U"is displayed and
the red fault indicator flashes.
Burner fault: "E" is displayed and the
red fault indicator on the control unit
flashes.
Heating water temperature or required
room temperature too low.
Remote control fault.
Remedy
&
Switch ON the ON/OFF switch "8"
(see page 8).
&
Switch ON mains electrical isolator, if
installed (outside the boiler room).
& Check the circuit breaker inside
power distribution (main domestic
circuit breaker) and reset it, if
required.
Adjust the heating program "G".
Wait until the DHW cylinder has been
heated up or, if an instantaneous water
heater is installed, until no more DHW
is being drawn (p extinguishes in the
display).
LPG:
Check fuel level and, if necessary, re-
order fuel.
Natural gas:
Open the gas shut-off valve and check
with your gas supplier, if required.
Check the fault code on the display
(see page 25) and notify your local
heating contractor.
Press burner fault reset "E" – if that
attempt to start also fails, notify your
heating contractor.
Raise the heating water temperature or
the required room temperature (see
remote control operating instructions).
Notify your local heating contractor.

What to do if ...

23