Troubleshooting 11
0020177748_03 ENERGY Installation and maintenance instructions 23
10.13 Completing inspection and maintenance
work
1. Check the gas connection pressure (gas flow pressure).
(→ Page 18)
2. Check the CO₂ content.
10.14 Checking the product for leak-tightness
▶ Check that the product is leak-tight. (→ Page 19)
11 Troubleshooting
11.1 Rectifying faults
▶ If fault codes (F.XX) are present, refer to the table in the
appendix for advice or use the check programme(s).
Overview of fault codes (→ Page 30)
Check programmes – Overview (→ Page 25)
If several faults are present at the same time, the fault codes
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.
11.2 Calling up the fault memory
The last ten fault codes are stored in the fault memory (to-
gether with the time at which the respective fault occurred).
▶
Press and hold the button for more than
seven seconds.
Overview of fault codes (→ Page 30)
▶
Press the button to exit this menu.
11.3 Deleting the fault memory
▶ Delete the fault memory (d.94).
Overview of diagnostics codes (→ Page 26)
11.4 Preparing the repair work
1. Decommission 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. Make sure 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 components.
11.5 Replacing defective components
11.5.1 Replacing the burner
1. Remove the gas-air mixture unit. (→ Page 21)
2. Remove the burner seal.
3. Remove the burner.
4. Install the new burner complete with new seal on the
heat exchanger.
5. Install the gas-air mixture unit. (→ Page 22)
11.5.2 Replacing the gas-air mixture unit
1. Remove the gas-air mixture unit. (→ Page 21)
2. Install the new gas-air mixture (→ Page 22).
11.5.3 Replacing the heat exchanger
1. Remove the side section. (→ Page 9)
2. Remove the gas-air mixture unit. (→ Page 21)