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Sorry, the previous thread is carried forward. Can somebody help me how to clean venturi for SD thelia 623? Thanks

Hi All I have a typical problem with my boiler. As the boiler was making noise, I flushed the system and put the pressure back to 2 bars.For quite a long time the pilot does not lit on its own then I manually lit the pilot. The system rolls water as usual, it makes usual gussling sound, but...