Inspection and maintenance
50
ecoTEC plus installation and maintenance instructions 0020134823_01
13
13.3.2
Carrying out electronics self-tests
Menu ¬ Installer level ¬ Test programmes ¬ Electronics
self-test
With the electronics self-test, you can test the relays on the
PCB.
13.4
Removing/fitting the upper casing
2
1
13.3 Removing/fitting the upper casing
To remove the upper casing:
>
Unscrew the screws (
2
).
>
Pull out the upper casing (
1
) towards the front.
To fit the upper casing:
>
From above, place the upper casing (
2
) on the boiler.
>
Use the screws (
1
) to secure the upper casing.
13.5
Carrying out maintenance work
13.5.1
Removing the gas-air mixture unit
a
Danger!
Risk of being burned or scalded by hot
components!
There is a risk of being scalded or burned
on the gas-air mixture unit and on all water-
carrying components.
>
Only carry out work on these compo-
nents if they have cooled down.
The gas-air mixture unit consists of four main components:
– Speed-regulated fan
– Air intake pipe
– Gas valve
– Burner
>
Switch the boiler off with the on/off button.
>
Isolate the boiler from the power mains.
>
Close the gas isolator cock on the boiler.
>
Close the service valves on the boiler.
>
Remove the front casing from the boiler (
¬ section 4.6
).
>
Undo the upper screws in the side panels.
>
Move the side sections slightly outwards.
>
Tilt the front unit cover upwards and pull it forwards.
Only on VU GB 806/5 - 5:
2
1
13.4 Remove the air intake pipe (only for VU GB 806/5 - 5)
>
Undo the clip (
1
) on the air intake pipe (
2
).
>
Remove the air intake pipe from the intake port.
For all units:
3
4
13.5 Separate the gas pipework (VU GB 806/5 - 5)
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