Troubleshooting; Detecting And Rectifying Faults; Procuring Spare Parts; Inspection And Maintenance - Vaillant auroSTOR VIH S GB 300/3 BES Installation And Maintenance Instructions Manual

8 Troubleshooting

8 Troubleshooting
8.1

Detecting and rectifying faults

▶
If problems occur whilst operating the product, check
certain points with the aid of the table in the appendix.
Detecting and rectifying faults (→ Page 17)
8.2

Procuring spare parts

The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the reverse of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
9

Inspection and maintenance

9.1 Observing inspection and maintenance
intervals
Adhere to the minimum inspection and maintenance inter-
vals. The inspection may require maintenance to be carried
out earlier, depending on the results.
Inspection and maintenance work – Overview (→ Page 17)
The immersion heater can be removed in order to inspect
the inside of the cylinder.
9.2

Draining the product

1. Close the cold water draw-off valve.
2. Secure a hose to the drain valve.
3. Position the hose at a suitable outflow.
4. Open the highest hot water valve in the system.
5. Open the drain valve and drain the product completely.
6. Close the hot water valve and the drain valve.
7. Remove the hose.
9.3 Checking the safety group's expansion
relief valve and the cylinder's expansion
relief valve
1. Open all expansion relief valves by turning the plug.
2. Check whether the water is flowing into the tundish.
3. Check that the expansion relief valves are in the correct
position and then check the pressure.
16
9.4 Checking the pre-charge pressure of the
expansion vessel
1. Drain the product. (→ Page 16)
2. Measure the pre-charge pressure of the expansion ves-
sel at the vessel valve.
Conditions: Pressure <0.3 MPa (0.3 bar)
▶
Top up the expansion vessel in accordance with the
static height of the heating installation, ideally with ni-
trogen, otherwise with air.
3. If water escapes from the valve of the expansion ves-
sel, you must replace the expansion vessel.
4. Fill and purge the product. (→ Page 15)

10 Decommissioning the product

▶
Switch off the heat generator.
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Unplug the domestic hot water cylinder's mains plug.
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Close the cold water stop cock.
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Drain the product. (→ Page 16)
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Remove the hydraulic connections and the temperature
sensor.
▶
Remove the cables for the temperature sensor from the
heat generator, controller or multi-functional module.

11 Customer service

To ensure regular servicing, it is strongly recommended
that arrangements are made for a Maintenance Agreement.
Please contact Vaillant Service Solutions for further details:
Telephone: 0330 100 3461
Installation and maintenance instructions auroSTOR 0020221298_02