Replacing Primary Heat Exchanger; Replacing Electronics And Display - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

9.5

Replacing primary heat exchanger

Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
1
2
4
Fig. 9.5 Replacing primary heat exchanger
• Disconnect the appliance from the mains as described in
Section 9.1, and close the service valve in the gas supply pipe.
• Close the flow and return service valves and drain the
appliance.
• Remove the burner module as described under 7.2.1.
• Remove the expansion vessel as described under 9.4.
• Pull out the condensate pipe to the siphon from the
primary heat exchanger.
Fig. 9.6 Primary heat exchanger holder
Instructions for installation and servicing ecoTEC / 839592_09
• Pull out the clamps (1) and (2) and free the return pipe
• Remove the four screws (3) on the primary heat
• Disconnect the plug-in connection (2) of the thermal
• Remove the three screws (3) on the primary heat
• Turn the holder to the side around the rivet (1), pull
3
• Mount the new primary heat exchanger in reverse
• Fill and vent the boiler as required.
• After completing the work, check for gas and water
9.6
• Comply with the assembly and installation manuals
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 mes-
sage "F70".
• In the second diagnostic level, under the diagnostic
1
2
3
The electronics is now set to the appliance type and the
parameters of all adjustable diagnostics numbers corre-
spond to the factory settings.
Parts replacement 9
as well as the flow pipe on the primary heat exchanger.
exchanger holder.
fuse in the primary heat exchanger.
exchanger holder.
the primary heat exchanger downwards to the right
and remove it from the appliance.
order and replace the seals.
Caution!
Risk of damaging the primary heat exchanger!
Neither loosen nor retighten the four screws
(Fig. 9.5, Pos. 4).
Caution!
Insert the seal rings for the flow and return pipe
on the primary heat exchanger with a suitable
lubricant.Insert the flow and return connection
in the primary heat exchanger as far as they will
go and make sure the clamps are fitted correctly
on the flow and return pipe (see fig. 9.5).
leaks and perform a function check (see section 7.6)!

Replacing electronics and display

Danger!
Before replacing the component, comply with
the safety instructions in Section 9.1.
provided with the spare parts.
number "d.93" enter the number of appliance variant
according to Table 9.1 (see section 8.1.2).
49