Removing The Burner And Checking The Burner Gasket (Replace Gasket Every 2 Years) - Viessmann Vitodens 333-F Service Instructions Manual

Further details regarding the individual steps
Removing the burner and checking the burner gasket
(replace gasket every 2 years)
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.
Commissioning, inspection, maintenance
(cont.)
3. Pull electrical cables from fan
motor A, gas valve B, ionisation
electrode C, ignition unit D and
earth tab E.
4. Undo gas supply pipe fitting F.
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