Fault Messages In The Display - Viessmann VITODENS 100-W Manual

Was ist zu tun?
System characteristics
What to do if ...
... the heating system
does not start
... the burner does not ig-
nite, display shows fault
symbol U
the burner switches off
although the set room
temperature has not
been reached
... the rooms are cold,
even though the burner is
working
the temperature of the
hot water is too low

Fault messages in the display

16
(Fortsetzung)
Cause
System controls inclu-
ding room thermostats
not calling for heat.
Control fault
Fault in air supply or in
the flue
Heating water tempera-
ture or room temperatu-
re is set too low
DHW priority
Fault on Vitotrol 100 or
similar programmable
room thermostat
The hot water tempera-
ture is set too low or ro-
tary selector tw is set
ON 9
Any faults in your heating system are
indicated on the display by a flashing
fault symbol U .
Read off the fault code on the display
and report it to your heating engineer.
Solution
Switch on system con-
trols to create demand.
Read off the fault codes
on the display. Contact
the heating engineer and
report fault codes.
Contact your heating en-
gineer.
Increase heating water
temperature by turning
rotary selector tr
(see page 10) or increase
set room temperature
(see Vitotrol 100 manu-
al).
Stop using hot water
Contact your heating en-
gineer.
Set desired hot water
temperature