Checking The Condensate Discharge Pipe And Tundish; Troubleshooting; Decommissioning; Temporarily Decommissioning The Product - Vaillant ecoTEC plus VU Series Operating Instructions Manual

5.5 Checking the condensate
discharge pipe and tundish
The condensate discharge pipe and tun-
dish must never be blocked and condens-
ate should be able to flow freely.
▶
Regularly check the condensate dis-
charge pipe and tundish 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.

6 Troubleshooting

Danger!
Risk of death caused by im-
proper repair work
▶
If the power supply cable is
damaged, never replace this
yourself.
▶
Contact the manufacturer,
customer service or a simil-
arly qualified person.
▶
If fault codes (F.XXX), LHM codes
(N.XXX) are shown in the display or
faults occur, proceed in accordance
with the tables in the appendix.
Fault codes/limp home mode codes
(→ Appendix C)
Troubleshooting (→ Appendix D)
▶
If you are unable to eliminate the fault
or malfunction using the specified
measures in the tables, contact a
competent person.
▶
If N.XXX limp home mode codes are
shown on the display, the system can
still be operated safely; however, please
contact a competent person to have the
fault eliminated.
16

7 Decommissioning

7.1 Temporarily decommissioning
the product
Condition: Risk of frost
▶
Press .
◁
The display goes out. The standby
button continues to light up.
◁
However, the frost protection for the
heating installation is active.
Condition: No risk of frost
▶
Switch off the product at the switched
fused spur box.
◁
The display goes out. The product is
not working.
◁
The frost protection function is deac-
tivated.
▶
Close the gas stopcock on the product.
Validity: Product with integrated hot water generation
OR Product with connected domestic hot water cylin-
der
▶
Close the cold-water isolation valve.
7.2 Permanently decommissioning
the product
▶
Have a competent person permanently
decommission the product.

8 Restarting

1. If the product was switched off at the
switched fused spur box, switch it
back on there.
◁
The display lights up.
2. If the gas stopcock on the product
was closed, open the gas stopcock.
◁
The product starts up.
Validity: Product with integrated hot water generation
OR Product with connected domestic hot water cylin-
der
▶
Open the cold-water isolation valve.
Operating instructions 0020308119_02