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Its probably wired to the lighting system like mine and as @gs/e60/1m? mentioned ..
When the lights are on (be it in auto or normal evening/night) it works fine and the exhaust flaps are able to function fine ... but when the lighting is switched off be it in auto mode (daylight) or manually set to off "0" then it remains open but with the switch will show white but unable to turn red .
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