Switching The Product To Standby Mode; Troubleshooting 5; Detecting And Rectifying Faults; Calling Up (Live Monitor) Status Codes - Vaillant VU 306/6-3 OV (HGB) ecoFIT sustain 430 Operating Instructions Manual

Note
To keep the frost protection devices active, you
should switch your product on and off using the
controller, if one is provided.
If the heating flow temperature falls below 5 °C when the
on/off button is on, the product comes into operation and
heats the circulating water to approx. 30 °C on both the heat-
ing side and the hot water side (if available).
4.11.2 Draining the heating installation
When the unit is switched off for an extended period, frost
protection can be guaranteed by completely draining the
heating installation and the product.
▶
Consult a competent person about this.
4.12

Switching the product to standby mode

▶
Press the reset button for less than three seconds.
◁
The display shows OFF and goes out.
◁
The product is now in standby mode.
◁
The product's frost protection function is activated.
◁
The main power supply is not interrupted. The
product continues to be supplied with power.
5 Troubleshooting
5.1

Detecting and rectifying faults

▶
If faults occur or fault messages are displayed (F.xx),
proceed as set out in the table in the appendix.
Troubleshooting (→ Page 9)
▶
If the product is not functioning correctly, contact a com-
petent person.
5.2

Calling up (Live monitor) status codes

▶
Press and at the same time.
Status codes – Overview (→ Page 9)
◁
The current operating status (status code) is shown
on the display.
6

Care and maintenance

6.1

Maintenance

An annual inspection of the product carried out by a compet-
ent person is a prerequisite for ensuring that the product is
permanently ready and safe for operation, reliable, and has a
long working life.
0020277263_00 ecoFIT sustain Operating instructions
6.2

Caring for the product

▶
Clean the casing with a damp cloth and a little solvent-
free soap.
▶
Do not use sprays, scouring agents, detergents, solvents
or cleaning agents that contain chlorine.
6.3

Reading maintenance messages

If the symbol is shown in the display, the product requires
maintenance work.
The product is not in fault mode but continues to operate.
▶
Consult a competent person about this.
▶
If the water pressure is flashing at the same time, simply
add more heating water.
6.4 Checking the condensate discharge pipe
and tundish
The condensate discharge pipe and tundish must always be
penetrable.
▶
Regularly check the condensate discharge pipe and tun-
dish for faults and, particularly, for blockages.
You must not be able to see or feel any obstructions in the
condensate discharge pipe and tundish.
▶
If you notice a fault, have it eliminated by a competent
person.
7

Decommissioning

7.1

Temporarily decommissioning the product

Caution.
Risk of material damage due to frost.
The frost protection and monitoring devices
are only active while the unit is connected
to the power mains and switched on via the
on/off button, and when the gas isolator cock
is open.
▶
Temporarily decommission the product
only if no frost is expected.
▶
Temporarily decommission the product only if no frost is
expected.
▶
Switch off the product via the main switch installed on-
site.
◁
The display goes out.
▶
When decommissioning the product for a prolonged
period (e.g. holiday), close the gas isolator cock and also,
for combination products, the cold water stop valve.

Troubleshooting 5

7