Checking The Product For Leak-Tightness; 11 Inspection And Maintenance; Using Original Seals - Vaillant ecoFIT pure 825 Installation And Maintenance Instructions Manual

11 Inspection and maintenance

10.5.7 Replacing the PCB for the user interface
A
1. Open the electronics box. (→ Page 13)
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).
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D
C
C
B
A
2
10.5.9 Replacing the flow sensor
B
1. Push the volume flow sensor's handle towards the rear
of the boiler.
2. Pull the volume flow sensor (1) out of its holder.
3. Remove the plug from the volume flow sensor.
4. Connect the plug to the new volume flow sensor.
5. Insert the volume flow sensor into its holder and ensure
that the plug cable is not damaged.
6. Lock the volume flow sensor into its position as soon as
it is positioned correctly.
10.5.10 Replace the pressure sensor
1
2
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).
10.6

Checking the product for leak-tightness

▶
Check that the product is leak-tight. (→ Page 19)
11 Inspection and maintenance
11.1

Using original seals

If you replace components, use only the enclosed original
seals; additional sealing materials are not required.
Installation and maintenance instructions ecoFIT pure 0020230531_01
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