Vaillant ecoFIT sustain 615 Installation And Maintenance Instructions Manual page 23

2
11. Remove the clip underneath the condensate tray (1).
12. Undo the four screws (2).
1
A
B
13. Remove the ignition electrode (1).
14. Lift the heat exchanger up slightly and remove it to-
gether with the condensate tray.
15. Remove the ignition transformer (2).
16. Install the new heat exchanger in reverse order.
10.6.4 Replacing the pump head
1. Disconnect the pump cable from the electronics box.
2. Undo the four bolts (1).
3. Remove the pump head (2).
4. Replace the O-ring.
5. Use four screws to secure the new pump head.
6. Connect the pump cable to the electronics box.
0020277252_00 ecoFIT sustain Installation and maintenance instructions
10.6.5 Replacing the expansion vessel
1.
1
A
2.
2
3.
4.
C
5.
6.
7.
8.
9.
10.6.6 Replacing the main PCB
1
1.
2
2.
3.
4.
5.
6.
7.
Troubleshooting 10
Drain the product. (→ Page 27)
B
A
Undo the nut (3).
Remove both screws on the support plate (1).
Remove the support plate.
Pull out the expansion vessel (2) towards the front.
Insert the new expansion vessel into the product.
Screw the new expansion vessel to the water connec-
tion. To do this, use a new seal.
Attach the support plate using both screws.
Fill and purge the product (→ Page 16) and, if required,
the heating installation.
A
Open the electronics box. (→ Page 12)
Pull all of the plugs out from the PCB.
Undo the clips on the PCB.
Remove the PCB.
Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
Plug in the PCB plugs.
Close the electronics box.
1
C
2
D
3
C
C
D
B
A
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