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I have just noticed you said 3mBar, fck me Never seen a inlet pressure that low, when I was restricting flow to the duotec, below 1mBar it cut out, wouldn't work lower.
Then again as said by someone else, no way should it still be working that low.
Seen quite a few greenstars as low as 14mBar to 16mBar and still really low co readings, clarified it with worcester myself and all accounts quite normal on the cdi's due to the air gas ratio valves.
As long as my FGA reads ok I'm a happy man on room sealed fan draught.
Then again as said by someone else, no way should it still be working that low.
Seen quite a few greenstars as low as 14mBar to 16mBar and still really low co readings, clarified it with worcester myself and all accounts quite normal on the cdi's due to the air gas ratio valves.
As long as my FGA reads ok I'm a happy man on room sealed fan draught.