Viessmann VITODENS 200-W WB2B Service Instructions For Contractors page 18

Commissioning, inspection, maintenance
Further details regarding the individual steps
1. Switch OFF the main power supply
and the ON/OFF switch at the con-
trol unit.
2. Close the gas shut-off valve and
safeguard against reopening.
3. Unlock control unit A and pivot
forwards.
4. Remove cover panel B.
18
(cont.)
5. Pull cables from fan motor C, gas
train D, ignition unit E, earth tab
F and ionisation electrode G.
6. Release gas supply pipe fittings
H.
7. Undo six screws K and remove
the burner.
8. Check burner gasket L for
damage. Replace gasket, if
required.