Rooms Are Too Hot - Viessmann VITODENS Operating Instructions Manual

What to do if...
Rooms are too cold
Cause
"Combustion controller" is displayed.
"Fault" is displayed. The red fault indica-
tor flashes.
"Screed drying" is active.
The mixer motor is faulty.

Rooms are too hot

Cause
■ Control unit incorrectly adjusted.
■ The remote control (if installed) is set
incorrectly.
Separate operating instructions
"Fault" is displayed. The red fault indica-
tor flashes.
The mixer motor is faulty.
46
(cont.)
Remedy
Press R (see page 22).
Acknowledge the fault (see page 41).
Check what type of fault it is. Acknowl-
edge the fault (see page 41). If necessa-
ry, notify your heating contractor.
No action required.
After expiry of the screed drying time, the
selected operating program will become
active.
Adjust the mixer manually.
Remedy
Check settings and correct if required:
■ Operating program (see page 25)
■ Room temperature (see page 25)
■ Time (see page 36)
■ Central heating time program (see
page 25)
■ Heating curve (see page 26)
Check what type of fault it is. Acknowl-
edge the fault (see page 41). If necessa-
ry, notify your heating contractor.
Adjust the mixer manually.
Danger
If faults are not rectified, they can
have life threatening consequen-
ces.
Do not acknowledge fault mes-
sages several times in quick suc-
cession. Notify your heating con-
tractor if a fault recurs. Your heat-
ing contractor will be able to ana-
lyse the cause and rectify the
fault.