Replacing Defective Components - Vaillant ecoFIT sustain 800 Series Installation And Maintenance Instructions Manual

13.5

Replacing defective components

13.5.1 Replacing the burner
1. Remove the gas-air mixture unit. (→ Page 31)
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 33)
13.5.2 Replacing the gas-air mixture unit
1. Remove the gas-air mixture unit. (→ Page 31)
2. Install the new gas-air mixture (→ Page 33).
13.5.3 Replacing the heat exchanger
1. Remove the front casing. (→ Page 16)
2. Remove the gas-air mixture unit. (→ Page 31)
1
B
3. Remove the gas pipe (1).
1
A
2
3
4. Remove the temperature sensor (3).
5. Remove the upper clip (1).
6. Remove the lower clip (4).
7. Remove the flow pipe (2).
0020230529_05 ecoFIT sustain Installation and maintenance instructions
A
8.
9.
10. Remove the return pipe (2).
A
11. Remove the clip underneath the condensate tray (1).
12. Undo the four screws (2).
1
2 4
B
13. Remove the ignition electrode (1).
14. Lift the heat exchanger up slightly and remove it to-
15. Remove the ignition transformer (2).
16. Install the new heat exchanger in reverse order.
1
2
2
B
Remove the upper clip (1).
Remove the lower clip (3).
2
A
B
gether with the condensate tray.
3
1
A
2
C
35