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Hi guys, I would like to ask your help. I would like to make an electronic circuit where it can detect the fan failure and indicates it with the light. The specs are as follow: -240VAC cooling fan (4 unit) -1 tower light (green & red) I want to make the light indicate green when all the fan are working but the red when 1 or more of the fan fault. Thank you guys for your cooperation. I really appreciate it.