Bosch Worcester Greenstar 8000 Series - Checking the Burner; Checking the Non-Return Valve in the Air-Gas; Manifold

Inspection and maintenance
Greenstar 8000 Style – 6720883855 (2019/01)
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8.9.1 Checking the burner
1. Remove the combustion cover  Fig. 62.
2. Unscrew the screws on the burner cover.
3. Remove the burner cover.
Fig. 76 Removing the burner cover
▶ Remove the burner and clean its components.
Fig. 77 Burner
▶ Reinstall the burner in reverse order, including a new gasket.
▶ Install the burner and the burner cover.
▶ Check the gas/air ratio.
8.9.2 Checking the non-return valve in the air-gas manifold
1. Unscrew the screws at the air-gas manifold.
2. Remove the air-gas manifold.
Fig. 78 Removing the air-gas manifold
1. Remove the non-return valve.
2. Check the non-return valve for contamination and cracks.
Fig. 79 Non-return valve in the air-gas manifold
▶ Install the non-return valve.
▶ Install the air-gas manifold.
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