I have a commercial kitchen and use a gas convection oven. It has been emitting a ton of CO and the aldehyde smell is crazy strong and definitely unsafe levels. I've had someone adjust the gas but it's still emitting CO. Flue is clear. No clue what's wrong here. The oven works beautifully and the CO level goes down after oven temp is reached.
I am a retired career chef, and had this one oven with choking CO in an airport catering kitchen. We had it serviced and it was fixed. It sounds like yours is not getting enough air mixed with the gas. Adjusting the gas is one thing but the venturi to the burners can partially block and unburned gas spills over. Remove the burner and venturi and boil it out in whatever you boil your fryers out with.
Are you on mains gas or propane because the jets are different.
https://www.google.com/search?q=commercial+oven+emitting+too+much+Carbon+Monoxide
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