11 Inspection And Maintenance - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

11 Inspection and maintenance

10.9.9 Replace the main PCB and/or the control
element's PCB
Caution.
Risk of material damage caused by incor-
rect repairs.
Using an incorrect PCB may lead to damage
to the electronics.
▶
Before replacing, check that the correct
PCB is available.
▶
Never use a different PCB when replacing
it.
If you are replacing only one component, the set parameters
are transferred automatically. When the product is switched
on, the new component adopts the previously set paramet-
ers from the unreplaced component.
10.9.9.1 Replacing the main PCB
B
1. Open the electronics box. (→ Page 19)
2. Undo the two clips (A) on the electronics box.
3. Remove the cover (B) from the electronics box.
B
4. Remove the PCB in accordance with the installation
instructions that are enclosed with the spare part.
5. Pull all of the plugs out from the PCB.
6. Force the fixing tabs (A) apart in order to loosen the
PCB.
7. Remove the PCB (B).
8. Install the new PCB.
9. Plug the plug into the new PCB.
36
10.9.9.2 Replacing the PCB for the user interface
1. Remove the main PCB.
2. Disconnect all of the plugs from the PCB for the user
interface.
3. Force the fixing tabs (A) apart in order to loosen the
PCB for the user interface.
4. Remove the PCB for the user interface (B).
5. Install the new PCB for the user interface.
6. Plug the plug into the new PCB for the user interface.
7. Reinstall the main PCB.
10.9.9.3 Replacing the main PCB and control
1. If you are replacing both components at the same time,
the product switches directly to the menu to select the
language after switching on. The default language set-
A
x 2
ting is English.
2. Select the required language.
3. Press OK to confirm this setting.
4. Set the product code D.093 that is on the data plate.
5. Confirm your setting.
◁
◁
6. Make the system-specific settings.
10.9.10 Completing repair work
1. Open the service valve in the cold water pipe.
A x 3
2. Open all service valves and the gas stopcock.
3. Check the leak-tightness of the gas pipe and the hy-
draulic circuits.
4. Install the front casing. (→ Page 11)
5. Switch on the product. (→ Page 24)
6. Check that the product works correctly.
7. Check that the product is leak-tight. (→ Page 28)
11 Inspection and maintenance
▶
Comply with the minimum intervals for the inspection and
maintenance ( Table in the appendix).
▶
Carry out maintenance work on the product at an earlier
point if the results of the inspection that was carried out
during previous maintenance make this necessary.
Installation and maintenance instructions ecoTEC plus 0020261389_02
B
element's PCB at the same time
The electronics are now set to the product type
(model) and the parameters for all diagnostics
codes are set to the default settings.
The display automatically restarts with the installa-
tion assistant.
A x 4