Vaillant home combi Installation And Maintenance Instructions Manual page 27

7
6
4
3
D
2
1
B
A
3. Remove the air intake pipe (2).
4. Remove the plug from the gas valve (3) and from the
fan (4).
5. Unscrew the gas connection pipe's connection (1) from
the gas valve.
6. Undo the two screws (5).
7. Remove the gas valve (3).
8. Remove the seal (6) if it is still in place on the fan (7).
9. Install the new gas valve in reverse order.
10. Check the CO₂ content. (→ Page 22)
11. Set the CO₂ content. (→ Page 23)
12.6.4 Replacing the heat exchanger
1. Remove the gas-air mixture unit. (→ Page 23)
1
B
2. Remove the gas pipe (1).
0020224355_00 HOME Installation and maintenance instructions
E
5
C
A
1
A
2
3
3. Remove the temperature sensor (3).
4. Remove the upper clip (1).
5. Remove the lower clip (4).
6. Remove the supply pipe (5).
1
A
2
7. Remove the upper clip (1).
8. Remove the lower clip (3).
9. Remove the return pipe (2).
4
3
2
10. Remove the clip underneath the condensate tray (1).
11. Undo the four screws (2).
Troubleshooting 12
5
B
2 3
B
A
4
1
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