Vaillant home combi, Installation And Maintenance Instructions Manual

Page: 27 / 52

Troubleshooting 12
0020224355_00 HOME Installation and maintenance instructions
27
B
D
E
A
C
5
6
7
3
2
1
4
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 CO
₂
content. (
→
Page 22)
11. Set the CO
₂
content. (
→
Page 23)
12.6.4 Replacing the heat exchanger
1. Remove the gas-air mixture unit. (
→
Page 23)
1
A
B
2. Remove the gas pipe (1) .
1
2
3
5 4
A
B
3. Remove the temperature sensor (3) .
4. Remove the upper clip (1) .
5. Remove the lower clip (4) .
6. Remove the supply pipe (5) .
2
2 3
B
1
A
7. Remove the upper clip (1) .
8. Remove the lower clip (3) .
9. Remove the return pipe (2) .
1
A
2
3
4
10. Remove the clip underneath the condensate tray (1) .
11. Undo the four screws (2) .