Vaillant ecoMAX 646 Service Manual download pdf (Page 30)

6.2 Routine maintenance

6.2.1 Remove front case

Remove bottom hinge screw

(1, fig. 46) and pull lower door panel

forward and down to release it from

the top hinge pin (2, fig. 46).

Slide the top panel up to release

retaining clips (1, fig. 47). Lift off top

panel.

•

Remove boiler bottom cover by

undoing two screws (1, fig. 51)

and slackening two screws (2, Fig.

51).

6.2.2 Turn off the boiler (fig. 45)

•

Isolate the electrical supply to the

boiler

•

Turn off the gas service valve (2)

•

Turn off boiler CH service valves

(1 and 5)

•

Turn off DHW cold water service

valve (4).

6.2.3 Remove combustion chamber

front cover (5, fig. 44)

Remove four screws (2, fig. 54)

securing combustion chamber front

cover

Lift combustion chamber clear of top

retaining lugs and pull forward.

Remove combustion chamber cover by

first bringing the left side forward to

clear boiler casing.

6.2.4 Inspect main heat exchanger

Remove five screws securing heat

exchanger front panel (1 and 3,

fig. 48) and remove by gently pulling

down and forward.

Inspect main heat exchanger and

remove any deposits with a soft brush.

fig. 46

GW 606/0

fig. 47

GW 605/0

fig. 45

GW 553/0

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Vaillant ecoMAX 646 Service Manual Page 30

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