Rooms Are Too Cold; Rooms Are Too Hot - Viessmann Vitotronic 100 Operating Instructions For The System User

What to do if...

Rooms are too cold

Cause
The heating system is switched off.
Control unit incorrectly adjusted.
Only for constant temperature control of a single boiler
system:
The DHW cylinder is being heated.
No fuel.
"Fault" is displayed.
"Burner fault" is displayed.

Rooms are too hot

Cause
Control unit incorrectly adjusted.
"Fault" is displayed.
Only for constant temperature control of a single boiler
system:
The DHW cylinder is being heated.
34
Remedy
Turn on the ON/OFF switch (see page 32).
■
Switch ON the mains isolator if installed (outside the
■
boiler room).
Set the MCB in the power distribution board (main do-
■
mestic MCB).
Check the settings and correct if required:
Operating program (see page 15)
■
Boiler water temperature (see page 21)
■
Only for boilers in a multi boiler system:
■
Boiler disabled (see page 23)
Wait until the DHW cylinder has been heated up.
Reduce the DHW draw-off rate or temporarily reduce
the DHW temperature as required.
With oil or LPG:
Check the fuel reserves and re-order if required.
For operation with natural gas:
Open the gas shut-off valve. If necessary, check with
your gas supply utility.
Check what type of fault it is. Acknowledge the fault
(see page 28). If necessary, notify your contractor.
Vitotronic 100, type CC1E:
■
Press the burner reset button.
See separate boiler or burner instructions.
Vitotronic 100, type CC1I:
■
Follow the instructions on the display (see page 29).
Contact your contractor if the burner still fails to start.
Danger
If faults are not rectified, they can have life
threatening consequences.
Do not acknowledge fault messages several
times in quick succession. Notify your contractor
if a fault recurs. Your contractor will be able to
analyse the cause and rectify the fault.
Remedy
Check the settings and correct if required:
Operating program (see page 15)
■
Boiler water temperature (see page 21)
■
Check what type of fault it is. Acknowledge the fault
(see page 28). If necessary, notify your contractor.
Wait until the DHW cylinder has been heated up.