Rooms Are Too Hot - Viessmann VITODENS Operating Instructions Manual

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 indicator flashes.
The mixer motor is faulty.
There is no hot water
Cause
The heating system is off.
Control unit incorrectly adjusted.
■
The remote control (if installed) is set incorrectly.
■
Separate operating instructions
No fuel.
"Fault" is displayed. The red fault indicator flashes.
The DHW is too hot
Cause
The control unit is incorrectly adjusted.
The DHW is being heated by the solar thermal system.
Remedy
Check the settings and correct if required:
Operating program (see page 13)
■
Room temperature (see page 24)
■
Time (see page 32)
■
Time program central heating (see page 25)
■
Heating curve (see page 25)
■
Check what type of fault it is. Acknowledge the fault
(see page 36). If necessary, notify your heating contrac-
tor.
Adjust the mixer manually.
Remedy
Turn on the ON/OFF switch (see page 22).
■
Switch on the mains isolator if installed (outside the
■
boiler room).
Set the MCB in the power distribution board (main do-
■
mestic MCB).
DHW heating must be enabled.
Check the settings and correct if required:
Operating program (see page 13)
■
Room temperature (see page 24)
■
Time (see page 32)
■
Time program central heating (see page 25)
■
Heating curve (see page 25)
■
With LPG:
Check the fuel reserves and re-order if required.
For 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 36). If necessary, notify your heating contrac-
tor.
Remedy
Check and correct the DHW temperature if required
(see page 29).
Check the settings at the solar control unit and correct
them if required.
Separate operating instructions
What to do if...
39