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 settings and correct if required:
Operating program (see page 18)
■
Room temperature (see page 18)
■
Time (see page 26)
■
Central heating time program (see page 18)
■
Heating curve (see page 19)
■
Check what type of fault it is. Acknowledge the fault
(see page 30). If necessary, notify your heating contrac-
tor.
Adjust the mixer manually.
Remedy
Turn on the ON/OFF switch (see diagrams from
■
page 16).
Switch on the mains isolator if installed (outside the
■
boiler room).
Reset the MCB in the power distribution board (main
■
domestic MCB).
DHW heating must be enabled.
Check settings and correct if required:
Operating program (see page 23)
■
DHW temperature (see page 23)
■
Time program DHW heating (see page 23)
■
Time (see page 26)
■
With oil/LPG:
Check the fuel reserves and re-order if required.
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 30). If necessary, notify your heating contrac-
tor.
Remedy
Check and correct the DHW temperature if required
(see page 23)
Check and correct settings, if required, at the solar con-
trol unit.
Separate operating instructions
What to do if...
33