Vaillant ecoTEC plus VC 406/5-5 - Resetting parameters to factory settings; Replacing defective components; Procuring spare parts; Preparing the repair work

10 Troubleshooting
30 Installation and maintenance instructions ecoTEC plus 0020261188_00
2
3
5
4
1
6
7
4. Pull out the plugs (1), (2), (3), (4) and (5).
5. Undo the three screws (7) between the mixture pipe
and the fan flange.
6. Replace the seal (6).
3
1
2
4
7. Remove the entire unit from the fan, Venturi and gas
valve assembly.
8. Undo the nuts (1) on the gas valve assembly.
9. Remove the clip (2).
10. Undo the fixing screws (4) on the gas valve assembly's
retainer.
11. Remove the gas valve assembly (3) from the retainer.
12. Replace the gas valve assembly if it is defective.
1
2
4
3
13. Remove the retainer (2) for the gas valve assembly. To
do this, undo the three screws (1).
14. Undo the fixing screws (3) for the Venturi.
15. Remove the Venturi (4).
16. Replace the Venturi if it is defective.
17. Replace the fan if it is defective.
2
1
4
3
5
18. Reinstall the components in the reverse order. You
must use new seals at position (4) and (5). Follow the
tightening sequence for the three screws that connect
the fan to the mixture pipe by following the numbering
(1), (2) and (3).
19. Screw the gas pipe onto the gas valve assembly. Use
new seals for this.
20. Hold on to the gas valve assembly when tightening the
union nuts.
21. Once the new components have been installed, carry
out the following steps.