Vaillant ecoTEC pure VCW 206/7-2 Installation And Maintenance Instructions Manual page 26

9 Troubleshooting
9.7.5 Replacing the main PCB
A
1. Prepare the repair work. (→ Page 24)
2. Open the electronics box. (→ Page 14)
3. Pull all of the plugs out from the PCB.
4. Undo the clips on the PCB.
5. Remove the PCB.
6. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
7. Plug in the PCB plugs.
8. Close the electronics box.
9. Complete the repair work. (→ Page 27)
9.7.6 Replacing the PCB for the user interface
A
1. Prepare the repair work. (→ Page 24)
2. Open the electronics box. (→ Page 14)
3. Pull the plug out of the PCB.
4. Undo the clips on the PCB.
5. Remove the PCB.
6. Install the new PCB in such a way that it clicks into the
groove at the bottom and into the clip at the top.
7. Plug in the PCB plug.
8. Close the electronics box.
9. Complete the repair work. (→ Page 27)
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9.7.7 Replacing the expansion relief valve
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).
9.7.8 Replacing the flow sensor
A
1. Pull out the plug.
2. Remove the flow sensor (1).
3. Install the new flow sensor.
4. Plug in the plug.
9.7.9 Replace the pressure sensor
1. Pull out the plug.
2. Remove the clip (1).
3. Remove the pressure sensor (2).
4. Install the new pressure sensor.
5. Reattach the clip (1).
Installation and maintenance instructions ecoTEC pure 0020258016_00
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