Worcester GR8700iW 35 C - Cleaning the Siphon and Heat Exchanger; Checking the Burner; Checking the Non-Return Valve in the Air-Gas; Manifold

Inspection and maintenance
57
Greenstar 8000 Style – 6720883864 (2019/02)
8.9 Cleaning the siphon and heat exchanger
WARNING:
Gaskets and seals - gas related components
▶ Replace gaskets and seals when disturbing gas related components
(e.g. burner, electrode assembly etc.), after cleaning the heat
exchanger.
▶ Do not attempt the cleaning procedure unless new gaskets and seals
are available.
There is an optional tool available to assist in cleaning the heat
exchanger, part number 7 719 001 996.
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.
The GR8700iW 45 and 50 appliances have a different 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
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