13 Troubleshooting
40 Installation and maintenance instructions Energy
7
0020300876_01
13 Troubleshooting
13.1 Eliminating faults
▶ If fault codes (F.XX) appear, consult the table in the ap-
pendix or use the check programme(s).
Overview of fault codes (→ Page 50)
Check programmes – Overview
If several fault codes are generated at the same time, these
are displayed alternately followed by the time at which the
respective fault occurred.
▶ Hold the button down for more than 3 seconds.
▶ If you are unable to clear the fault code and it reappears
despite several reset attempts, contact customer service.
13.2 Calling up the fault memory
The last 10 fault codes are stored in the fault memory (to-
gether with the time at which the respective fault occurred
and, after 24 hours, with the number of days).
▶ Hold the button down for more than 7 seconds.
Overview of fault codes (→ Page 50)
▶ Press the button to exit this menu.
13.3 Deleting the fault memory
1. Delete the fault memory using the diagnostics code
d.94.
2. Set diagnostics code . (→ Page 27)
Overview of diagnostics codes (→ Page 46)
13.4 Resetting parameters to factory settings
1. Reset all parameters to the factory settings using the
diagnostics code d.96.
2. Set diagnostics code . (→ Page 27)
Overview of diagnostics codes (→ Page 46)
13.5 Preparing the repair work
1. Switch off the product.
2. Disconnect the product from the electrical installation.
3. Remove the front casing.
4. Close the gas stopcock.
5. Close the service valves in the heating flow and in the
heating return.
6. Close the service valve in the cold water pipe.
7. Drain the product if you want to replace water-bearing
components of the product.
8. Ensure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals and O-rings. Do not use any addi-
tional sealing materials.
13.5.1 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 back page of these instructions.
▶ If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
13.6 Replacing defective components
13.6.1 Replacing the burner
1. Remove the gas-air mixture unit. (→ Page 37)
2. Remove the two burner seals.
3. Remove the burner .
4. Insert the new burner.
5. Insert two new burner seals in the burner hood.
6. Install the gas-air mixture unit. (→ Page 39)
13.6.2 Replacing the gas-air mixture unit
1. Remove the gas-air mixture unit. (→ Page 37)
2. Install the new gas-air mixture (→ Page 39).
13.6.3 Replacing the heat exchanger
1. Remove the front casing.
2. Remove the gas-air mixture unit. (→ Page 37)
3. Remove the gas pipe (1).
4. Remove the temperature sensor (3).
5. Remove the upper clip (1).
6. Remove the lower clip (4).
7. Remove the flow pipe (2).
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