Querying The Fault Memory; Resetting The Fault Memory; Performing Diagnostics; Using Check Programmes - Vaillant ecoTEC plus VU 446/5-5 (H-GB) Installation And Maintenance Instructions Manual

10 Troubleshooting
10.4

Querying the fault memory

Menu → Installer level → Fault list
The product has a fault memory. You can use this to query
the last ten faults that occurred in chronological order.
The display shows:
–
Number of faults that occurred
–
The fault that is currently selected with fault number F.xx
–
A plain text display explaining the fault.
▶
Use the or button to display the last ten faults that
occurred.
Fault messages – Overview (→ Page 46)
10.5

Resetting the fault memory

▶
To delete the fault memory, press
10.6

Performing diagnostics

▶
You can use the diagnostics codes during fault dia-
gnostics to change individual parameters or to display
further information. (→ Page 29)
10.7

Using check programmes

▶
You can also use the check programmes for
troubleshooting. (→ Page 25)
10.8

Resetting parameters to factory settings

▶
To simultaneously reset all parameters to the factory
settings, set diagnostics code D.096 to 1.
10.9

Replacing defective components

1. Carry out the preparatory work before undertaking any
repair work. (→ Page 32)
2. Carry out the work required to finish the task before
undertaking any repair work. (→ Page 36)
10.9.1 Procuring spare parts
The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the back page of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
10.9.2 Preparing the repair work
1. Decommission the product.
2. Disconnect the product from the power grid.
32
3.
4.
5.
6.
7.
8.
9.
10.9.3 Replacing the burner
1.
(Delete, OK) twice.
2.
3.
4.
5.
6.
10.9.4 Replacing the gas valve assembly, Venturi or
Installation and maintenance instructions ecoTEC plus 0020261389_02
–
Take all necessary precautions to ensure that it
cannot be switched back on again.
Remove the front casing. (→ Page 10)
Close the gas stopcock.
Close the service valves in the heating flow and in the
heating return.
Close the service valve in the cold water pipe.
Drain the product to replace hydraulic components.
(→ Page 40)
Ensure that water does not drip on live components
(e.g. the electronics box).
Use only new seals.
Remove the compact thermal module. (→ Page 37)
2
1
Undo the four screws (1) on the burner.
Remove the burner.
Fit the new burner with a new seal.
Replace the burner flange seal (2).
Install the compact thermal module. (→ Page 38)
fan
Note
Each destroyed seal must be restored.