Fault Messages In The Display - Viessmann VITODENS 100 Operating Instructions Manual

System characteristics
What to do if ...
... the rooms are cold,
even though the burner is
working
... the temperature of the
hot water is too low

Fault messages in the display

(cont.)
Cause
Hot water priority
Fault on Vitotrol 100 or
similar programmable
room thermostat
The hot water tempera-
ture is set too low or
knob "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 in the display
and report it to your heating engineer.
What to do
Solution
Stop using hot water
Contact your heating en-
gineer.
Set desired hot water
temperature
15