16 Operating instructions 0020308119_02
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.
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.
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