Messages; Service And Troubleshooting; Caring For The Product; Overview Of The Faults - Vaillant VRC 700 Operating Instructions Manual

6 Service and troubleshooting

The advanced function heats the water in the domestic hot
water cylinder once until the desired DHW circuit temperat-
ure set is reached or until you cancel the advanced function
early. The heating installation will then return to the pre-set
mode.
5.4.7 System OFF (frost protection active)
Operating mode → System OFF
–
The heating function, hot water circuit and cooling are
switched off. The frost protection function is activated.
The circulation is switched off.
Ventilation is activated and works at the lowest ventilation
level.
5.5

Messages

5.5.1 Service message
If maintenance is required, the controller displays a mainten-
ance message on the display.
To prevent the heating installation from breaking down and
to prevent damage, you must pay attention to the service
message:
▶
If the operating instructions for the unit that is displayed
contain maintenance instructions for the service mes-
sage, carry out maintenance work according to the main-
tenance instructions.
▶
If the operating instructions for the unit displayed do not
contain maintenance instructions for the service mes-
sage, or if you do not want to carry out the maintenance
work yourself, inform a competent person.
The following service messages may appear:
–
Service heat generator 1 (boiler, heat pump)
–
Service heat generator 2 (boiler, heat pump)
–
Maintenance (of the heating installation)
–
Water deficiency, heat generator 1 (boiler, heat pump)
–
Water deficiency, heat generator 2 (boiler, heat pump)
–
Low water pressure, add. module (heat pump)
–
Service ventilation unit
5.5.2 Fault message
If a fault occurs in the heating installation,
display, along with a fault message. The competent person
must clear any faults or repair the heating installation, other-
wise, material damage may occur or the heating installation
may fail.
▶
Inform a competent person.
If you want to view the Basic display on the display, press
the left-hand selection button Back.
You can read the current fault messages under Menu →
Information → System status → Fault status. As soon
as a fault message occurs for the heating installation, the
Fault status setting level displays the value Fault list. The
right-hand selection button has been assigned the function
Display.
16
6 Service and troubleshooting
6.1

Caring for the product

▶
Clean the casing with a damp cloth and a little solvent-
free soap.
6.2

Overview of the faults

Detecting and rectifying faults (→ Page 23)
If the fault message Restricted operation/comfort pro-
tection inactive appears in the display, the heat pump has
failed and the controller enters limp home mode. The auxili-
ary heater now supplies the heating installation with heating
energy. During installation, the competent person has restric-
ted the temperature for limp home mode. You can feel that
the hot water and heating are not becoming very hot.
While you wait for the competent person to come, you can
use the rotary knob to implement the following settings:
–
Inactive: The controller works in limp home mode; heat-
ing and hot water only at a moderately warm temperature
–
Heating: The auxiliary heater over the heating mode;
heating hot, hot water cold
–
DHW: The auxiliary heater takes over the hot water
handling mode; hot water hot, heating cold
–
DHW+heat.: The auxiliary heater takes over the heating
and hot water handling mode; heating and hot water hot
The auxiliary heater is not as efficient as the heat pump,
meaning that using only the auxiliary heater to generate heat
is expensive.
If you want to implement settings on the controller, click on
Back and the basic display appears in the display. After five
minutes of no operation, the fault message appears again in
the display.
appears on the
7

Decommissioning

7.1

Replacing the controller

If the controller of the heating system needs to be replaced,
the heating system must be shut down.
▶
This work should be carried out by a competent person.
Caution.
Risk of material damage caused by un-
suitable cleaning agents.
▶
Do not use sprays, scouring agents, de-
tergents, solvents or cleaning agents that
contain chlorine.
Operating instructions VRC 700 0020200782_00