Vaillant ecoTEC plus Installation And Maintenance Instructions Manual page 46

13.6.9 Replacing the impeller sensor on the shift-
load cylinder
1. Close the domestic hot water system isolation valves
and drain the heat generator and shift-load cylinder on
the domestic hot water side.
1
5
4
3
2. Remove the drain pipe (1) from the expansion relief
valve on the heat generator.
3. Remove the plug from the impeller sensor.
4. Undo the screwed connections (2) and (3) on the angle
pieces (4) and (5).
5. Turn the impeller sensor slightly to the side and pull it
downwards to remove it from the housing.
6. Remove the pipe elbow from the impeller sensor.
7. Install the pipe elbow on the new impeller sensor and
use new seals for it.
8. Install the new impeller sensor in reverse order and use
new seals.
9. Connect the connection cable plug to the new impeller
sensor.
10. Reinstall the drain pipe (1) and use new seals.
11. Fill and purge the heat generator and the shift-load
cylinder.
13.6.10 Replacing the PCB or display for the heat
generator
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 24)
2. Replace the PCB or display according to the assembly
and installation instructions supplied.
46
3.
4.
13.6.11 Replacing the PCB and display for the heat
1.
2.
2
3.
4.
5.
6.
7.
8.
13.6.12 Replacing the PCB on the shift-load cylinder
1.
2.
Installation and maintenance instructions ecoTEC plus 0020244998_04
If you are replacing the PCB, remove the coding res-
istor (1) (plug X24) from the old PCB and plug the plug
onto the new PCB.
Close the electronics box.
generator
Open the electronics box. (→ Page 24)
Replace the PCB and display according to the
assembly and installation instructions supplied.
Remove the coding resistor (1) (plug X24) from the old
PCB and plug the plug into the new PCB.
Close the electronics box.
Press the on/off button on the product. (→ Page 28)
◁
After switching on, the product switches directly to
the menu to select the language. The factory-set
language setting is English.
Select the required language and confirm by pressing
.
◁
You are automatically taken to D.093 to set the
device specific number.
Set the correct value for the relevant product type in ac-
cordance with the table below and confirm by pressing
.
Product type number
VUI 286/5-5 (H-GB) ecoTEC
plus 938
◁
The electronics are now set to the product type and
the parameters of all diagnostics codes are set to
factory settings.
◁
The installation assistant starts.
Make the system-specific settings.
Comply with the assembly and installation instructions
provided with the spare parts.
Unscrew the screw from the cover of the shift-load cyl-
inder and remove the cover.
1
1
17