Replacing The Pcb On The Layered Storage Tank; Decommissioning; Temporarily Shutting Down The Boiler; Taking The Boiler Permanently Out Of Service - Vaillant ecoTEC plus VUI Installation And Maintenance Instructions Manual

14.11.3 Replacing the PCB on the layered storage
tank
> Comply with the assembly and installation manuals pro-
vided with the spare parts.
> Unscrew the bolt from the cover of the layered storage
tank and remove the cover.

14.19 Replacing the PCB on the layered storage tank

> Remove the electronics box with the layered storage
tank PCB (1) from the appliance slot.
> Open the electronics box and remove the plug.
> Install the new PCB in reverse order.
> Start up the unit.
Installation and maintenance instructions ecoTEC plus 0020134833_01
15

Decommissioning

15.1
b
1
2
50
15.1 Switching off the boiler
> Close the gas isolator cock.
> Close the cold water stop valve.
> Drain the heating installation fully (¬ section 12.2.2).
> Press the on/off switch (1).
The display (2) goes off.
15.2
> Close the gas isolator cock.
> Close the cold water stop valve.
> Drain the heating installation fully (¬ section 12.2.2).
> Press the on/off switch (1).
The display (2) goes off.
> Isolate the boiler from the power mains.
> Dispose of the boiler correctly (¬ section 15.3).
Decommissioning

Temporarily shutting down the boiler

Caution.
Risk of frost damage due to incorrect
shutdown.
If you switch off the boiler using the on/off
switch or disconnect it from the power
mains, this can cause frost damage to the
heating installation.
> Only shut down the boiler fully if the
heating installation is otherwise pro-
tected from frost.
> Drain the heating installation fully.
Taking the boiler permanently out of
service
15
1
83