Vaillant ecoFIT sustain Series Installation And Maintenance Instructions Manual page 35

13.5.4 Replacing the pump head
1. Disconnect the pump cables from the electronics box.
2. Undo the four screws (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 cables to the electronics box.
13.5.5 Replacing the expansion vessel
1. Drain the product. (→ Page 33)
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2. Undo the nut (3).
3. Remove both screws on the support plate (1).
4. Remove the support plate .
5. Pull out the expansion vessel (2) towards the front.
6. Insert the new expansion vessel into the product.
7. Screw the new expansion vessel to the water connec-
tion. To do this, use a new seal.
8. Attach the support plate using both screws.
9. Fill and purge the product (→ Page 25)and, if required,
the heating installation.
0020230529_06 ecoFIT sustain Installation and maintenance instructions
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13.5.6 Replacing the PCB
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1. Open the electronics box. (→ Page 20)
2. Pull all of the plugs out from the PCB.
3. Undo the clips on the PCB.
4. Remove the PCB.
5. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
6. Plug in the PCB plugs.
7. Close the electronics box.
13.5.7 Replacing the PCB for the user interface
A
1. Open the electronics box. (→ Page 20)
2. Pull the plug out of the PCB.
3. Undo the clips on the PCB.
4. Remove the PCB.
5. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
6. Plug in the PCB plug.
7. Close the electronics box.
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