Resetting Parameters To Factory Settings; Preparing The Repair Work; Replacing Defective Components - Vaillant ecoTEC exclusive 627 Installation And Maintenance Instructions Manual

13.5

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
.
13.6

Preparing the repair work

1. Temporarily decommission (→ Page 41) the product.
2. Disconnect the product from the power grid.
3. Remove the front casing. (→ Page 16)
4. Close the service valves in the heating flow, in the heat-
ing return and in the cold water pipe.
5. Close the gas stopcock.
6. Drain the product (→ Page 36) if you want to replace
any of the product's water-bearing components.
7. Make sure that water does not drip on live components
(e.g. the electronics box).
8. Use only new seals.
13.6.1 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 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.
13.7

Replacing defective components

13.7.1 Replacing the burner
1. Remove the compact thermal module. (→ Page 34)
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 36)
38
1
13.7.2 Replacing the gas valve assembly
1. Switch off heating mode and domestic hot water gener-
ation (→ 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.
5. Unscrew both screws to secure the gas valve assembly
to the fan.
6. Reinstall the new gas valve assembly in the reverse
order. Use new seals for this.
7. Read the offset value (1) that is imprinted on the new
gas valve assembly.
Installation and maintenance instructions ecoTEC exclusive 0020193966_04
1