Rooms Are Too Hot; There Is No Hot Water - Viessmann VITOTRONIC 100 Operating Instructions Manual

Rooms are too hot

Cause
Control unit incorrectly adjusted.
■
The room temperature controller is set incorrectly.
■
Separate operating instructions
"Fault" is displayed.
"External hook-up" enabled.
"External program" enabled.

There is no hot water

Cause
The heating system is off.
Control unit incorrectly adjusted.
■
The room temperature controller is set incorrectly.
■
Separate operating instructions
No fuel.
"Fault" is displayed.
Remedy
Check the settings and correct if required:
Operating program (see page 13)
■
Room temperature and boiler water temperature (see
■
page 15)
Check what type of fault it is. Acknowledge the fault
(see page 21). If necessary, notify your contractor.
No action required.
The operating program set at the control unit was e.g.
changed over via an externally connected button.
Example: In a school, heating demand exists outside of
school times, e.g. for a parents' evening.
This function cannot be influenced via the control unit.
Once the external changeover no longer applies, the
set operating program becomes active again.
The operating program set at the control unit has been
changed over by another control device. E.g., by your
mobile phone using your Viessmann app.
You can change the operating program on the
Vitotronic control unit.
Remedy
Switch ON the ON/OFF switch (see page 24).
■
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 set.
Check the settings and correct if required:
Operating program (see page 13)
■
DHW temperature (see page 16)
■
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 21). If necessary, notify your contractor.
What to do if...
27