Operating Levels; Operation; Starting Up The Product; Basic Display - Vaillant HOME REGULAR 12-A Operating Instructions Manual

4 Operation

Symbol Meaning
Fault in the product
/
– Appears instead of the

basic display.

– Appears when switching
OFF
the product to standby
mode.
3.4.2 Description of button
functions
Button Meaning

– Selecting the operating mode

– Confirm the operating mode
– Confirm setting
– Increase the display contrast
– Setting the hot water temperat-
or
ure
– Setting the heating flow tem-
perature
– Increase or decrease the selec-
ted setting
– Increase the display contrast
– Activate the product: On/off
(standby)
– Reset the product
Adjustable values flash on the display.
You must confirm any change to a value.
Only then is the new setting saved.
If you do not press any buttons for five
seconds, the displays switches back to
the basic display.
If you do not press any buttons for one
minute, the display contrast decreases.

3.5 Operating levels

The product has two operating levels.
– Operator operating level: This provides
access to the most important informa-
tion and setting options that do not re-
quire any particular prior knowledge.
– Operating level for competent persons
only: This is protected by an access
code.
8
4 Operation

4.1 Starting up the product

4.1.1 Opening the isolator devices
1. Ask the competent person who in-
stalled the product to explain to you
where these isolator devices are loc-
ated and how to handle them.
2. Open the gas isolator cock fully.
3. Check that the heating installation flow
and return service valves are open, if
such service valves are installed.
4.1.2 Switching on the product
▶
Switch on the product via the main
switch installed on-site.
4.2 Basic display
The operating mode is displayed on the
basic display.
You can switch back to the basic display
by:
– Not pressing any button for longer than
5 seconds.
As soon as there is a fault message, the
basic display switches to the fault code.
4.3 Selecting the operating mode
Note
The unit is always activated with
the preselected operating mode.
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