Querying The Fault Memory; Performing Diagnostics; Using Check Programmes; Resetting Parameters To Factory Settings - Vaillant ecoTEC plus VU Series Installation And Maintenance Instructions Manual

10 Decommissioning the product

9.4

Querying the fault memory

The product has a fault memory. You can use this to query
the last ten faults that occurred in chronological order.
▶
Press and at the same time to display the last ten
faults that occurred.
Overview of fault codes (→ Page 34)
▶
Use to scroll back in the fault memory.
▶
To exit the fault memory display, press
press any button for approximately four minutes.
◁
Depending on the settings, the current flow temperat-
ure or current water pressure of the heating installa-
tion reappears in the display.
9.5

Performing diagnostics

▶
You can use the diagnostics codes (→ Page 22) during
fault diagnostics to change individual parameters or to
display further information.
9.6

Using check programmes

▶
You can also use the check programmes (→ Page 16)for
troubleshooting.
9.7

Resetting parameters to factory settings

▶
To simultaneously reset all parameters to the default
settings, set D.96 to 1.
9.8

Preparing the repair work

1. Decommission the product.
2. Disconnect the product from the power mains.
3. Remove the front casing. (→ Page 11)
4. Close the gas isolator cock.
5. Close the service valves in the heating flow and in the
heating return.
6. Close the service valve in the cold water pipe.
7. Drain the product if you want to replace water-bearing
components of the product.
8. Make sure that water does not drip on live components
(e.g. the electronics box).
9. Use only new seals.
9.9

Replacing defective components

9.9.1 Replacing the burner
1. Remove the compact thermal module. (→ Page 24)
1
2. Remove the four screws (1) from the burner.
28
3. Remove the burner.
4. Fit the new burner with a new seal.
5. Make sure that the cutouts in the seal and the burner
are situated above the burner flange sight glass.
6. Install the compact thermal module. (→ Page 27)
9.9.2 Replacing the PCB and/or the display
or do not
1. Disconnect the product from the power mains and make
sure that it cannot be switched back on again.
Conditions: Replacing the display or PCB
▶
Replace the PCB or display according to the assembly
and installation instructions supplied.
Conditions: Replacing the PCB and display at the same time
▶
Replace the PCB and display according to the assembly
and installation instructions supplied.
◁
If you replace both components at the same time, the
product switches to fault mode and displays the fault
message F.70 after it is switched on.
▶
In the second diagnostics level under the diagnostics
code d.93, enter the number of the product type.
▶
Confirm your setting.
◁
The electronics are now set to the product type and
the parameters of all diagnostics codes are set to
default settings.
▶
Make the system-specific settings.
9.10

Completing repair work

▶
Check that the product works correctly and is leak-tight,
see "Checking function and leak-tightness" (→ Page 21).
10 Decommissioning the product
▶
Switch off the product.
▶
Disconnect the product from the power mains.
▶
Close the gas isolator cock.
▶
Drain the product. (→ Page 27)

11 Recycling and disposal

Disposing of the packaging
▶
Dispose of the packaging correctly.
▶
Observe all relevant regulations.
Installation and maintenance instructions ecoTEC plus 0020029173_04
Note
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 parameters from the
unreplaced component.