Eliminating Faults; Calling Up/Clearing The Fault Memory; Resetting Parameters To Factory Settings; Preparing The Repair Work - Vaillant ECOTEC EXCLUSIVE 627 VU 256/5-7 Installation And Maintenance Instructions Manual

9.3

Eliminating faults

▶
If fault messages (F.XX) appear, eliminate the fault
by referring to the table in the appendix or using the
Function menu (→ Page 30) and the Check programmes
(→ Page 18).
Overview of fault codes (→ Page 43)
If several faults occur at the same time, the display shows
the corresponding fault messages for two seconds each in
alternation.
▶
Press (max. three times) to restart the product.
▶
If you are unable to eliminate the fault and the fault re-
curs despite reset attempts, contact customer service.
9.4

Calling up/clearing the fault memory

If faults have occurred, the last ten (max.) fault messages
are available in the fault memory.
▶
Navigate to Menu → Installer level → Fault list and con-
firm by pressing .
◁
The display shows the number of faults that have
occurred, the fault numbers and the corresponding
plain text display.
▶
Press or to call up individual fault messages.
▶
Press twice to delete the fault list.
9.5

Resetting parameters to factory settings

Navigate to Menu → Installer level → Diagnostics
1.
menu → D.096 Reset to factory settings? and con-
firm by pressing .
2.
Press to set the value to 1 and confirm by pressing
.
9.6

Preparing the repair work

1. Temporarily decommission (→ Page 33) the product.
2. Disconnect the product from the power mains.
3. Remove the front casing. (→ Page 11)
4. Close the service valves in the heating flow, in the heat-
ing return and in the cold water pipe.
5. Drain the product (→ Page 33) if you want to replace
any of the product's water-bearing components.
6. Make sure that water does not drip on live components
(e.g. the electronics box).
7. Use only new seals.
9.6.1 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 reverse of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
0020193966_01 ecoTEC exclusive Installation and maintenance instructions
9.7

Replacing defective components

9.7.1 Replacing the burner
1. Remove the compact thermal module. (→ Page 31)
2
2. Undo the four screws (1) on the burner.
3. Remove the burner.
4. Install a new seal (2) on the new burner.
5. Install the compact thermal module. (→ Page 32)
9.7.2 Replacing the gas valve assembly
1. Switch off heating mode and hot water generation (→
Operating instructions).
B
A
2. Remove the air intake pipe.
3. Remove the two plugs from the gas valve assembly.
4. Unscrew the union nut from the gas valve assembly.
Troubleshooting 9
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