Vaillant ecoFIT pure Installation And Maintenance Instructions Manual page 23

B
A
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 16) and, if required,
the heating installation.
10.5.6 Replacing the main PCB
A
1. Open the electronics box. (→ Page 11)
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.
0020230533_01 ecoFIT pure Installation and maintenance instructions
1
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2
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10.5.7 Replacing the PCB for the user interface
A
1. Open the electronics box. (→ Page 11)
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.
10.5.8 Replacing the expansion relief valve
1
1. Remove the clip (2).
2. Remove the expansion relief valve.
3. Fit the new expansion relief valve with a new O-ring.
4. Reattach the clip (2).
Troubleshooting 10
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