Replacing Electronics And Display - Vaillant ecoTEC plus Instructions For Installation And Servicing

> Disconnect the plug-in connection (2) of the thermal
fuse in the primary heat exchanger.
> Remove the three screws (3) on the primary heat
exchanger holder.
> Turn the holder to the side around the rivet (1), pull
the primary heat exchanger downwards to the right
and remove it from the appliance.
> Mount the new primary heat exchanger in reverse
order and replace the seals.
a
Caution!
Possible material damage caused by loose-
ning or retightening the screws!
The primary heat exchanger may become
damaged.
> You must neither loosen nor retighten the
four screws (Fig. 9.5, Pos. 4).
a
Caution!
Possible material damage caused by lubri-
cating the seals!
Mineral oil-based lubricants may damage the
seals. The seals should therefore not be lubri-
cated.
> Only use water or commercially available
soft soap, if necessary, to assist with instal-
lation.
> Fill and vent the boiler as required.
> After completing the work, check for gas and water
leaks and perform a function check (see section 7.6).
Instructions for installation and servicing ecoTEC 839592_13
Parts replacement
9.6

Replacing electronics and display

a
Danger!
Risk of personal injury and/or material
damage as a result of improper installation!
You need to follow the corresponding safety
instructions in order to safely replace the
component.
> Before replacing the component, comply
with the safety instructions in section 9.1.
> Comply with the assembly and installation manuals
provided with the spare parts.
Replacing display or electronics
If you are replacing only one of the two components, the
parameter adjustment functions automatically. On turning on
the appliance, the new component takes over the previously
set parameters from the components that are not replaced.
Replacing display and electronics
When replacing both components, after being turned on,
the appliance goes to fault and displays the error
message "F70".
> In the second diagnostic level, under the diagnostic
number "d.93" enter the number of appliance variant
according to Table 9.1 (see section 8.1.2).
The electronics is now set to the appliance type and the
parameters of all adjustable diagnostics numbers
correspond to the factory settings.
Appliance Device specific number
ecoTEC plus 612 0
ecoTEC plus 615 1
ecoTEC plus 618 2
ecoTEC plus 624 3
ecoTEC plus 630 4
ecoTEC plus 637 5
ecoTEC plus 824 6
ecoTEC plus 831 7
ecoTEC plus 837 8
ecoTEC pro 24 7
ecoTEC pro 28 0
Table 9.1 Device specific numbers
9
71