Vaillant ecoTEC pro Installation And Maintenance Instructions Manual - page 27
Troubleshooting 9
0020209589_01 ecoTEC pro Installation and maintenance instructions
27
6.
Detach the return connection.
7.
Remove two screws (1) on each of the two retainers.
1
2
8.
Remove the lower three screws (2) on the rear section
of the retainer.
9.
Swing the retainer to the side around the top screw (1).
10. Pull the heat exchanger downwards and to the right,
and remove it from the product.
11. Install the new heat exchanger in reverse order.
12. Replace the seals.
Note
Instead of grease, use only water or com-
mercially available soft soap to aid installa-
tion.
13. Insert the flow and return connections into the heat
exchanger as far as they will go.
14. Make sure that the brackets are seated correctly on the
flow and return connections.
15. Install the compact thermal module. (→ Page 30)
16. Fill and purge the product and, if necessary, the heating
installation. (→ Page 19)
9.6.4
Replacing the expansion vessel
1.
Drain the product. (→ Page 30)
1
2
3
4
2.
Undo the screwed connection (4).
3.
Remove both screws (1) on the support plate (2).
4.
Remove the support plate (2).
5.
Pull out the expansion vessel (3) towards the front.
6.
Insert the new expansion vessel into the product.
7.
Screw the new expansion vessel to the water connec-
tion. Use a new seal for this.
8.
Attach the support plate using both screws (1).
9.
Fill and purge the product and, if necessary, the heating
installation. (→ Page 19)
9.6.5
Replacing the PCB or the display
Note
If you only replace one component, when the
product is switched on, the new component ad-
opts the parameters that were previously set from
the component that was not replaced.
1.
Open the electronics box. (→ Page 15)
2.
Replace the PCB or display according to the assembly
and installation instructions supplied.
3.
Close the electronics box.
9.6.6
Replacing the PCB and the display
1.
Open the electronics box. (→ Page 15)
2.
Replace the PCB and display according to the
assembly and installation instructions supplied.
3.
Close the electronics box.
4.
Press the on/off button on the product. (→ Page 18)
◁
You are automatically taken to D.093 to set the
device specific number.
5.
Set the correct value for the relevant product type in ac-
cordance with the table below and confirm by pressing
.
Product type number
24 (VUW GB 246/5‑3 A) ecoTEC
pro
7
28 (VUW GB 286/5‑3 A) ecoTEC
pro
22
30 (VUW GB 306/5‑3) ecoTEC pro
26
◁
The electronics are now set to the product type and
the parameters of all diagnostics codes are set to
default settings.
6.
Make the system-specific settings.
9.7
Completing repair work
1.
Establish the power supply.
2.
Switch the product back on if this has not yet been
done. (→ Page 18)
3.
Install the front casing.
4.
Open all service valves and the gas isolator cock.
5.
Check that it works correctly and is leak-tight.
(→ Page 23)