Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Check the switch that is where it senses when the cover is open or closed, make sure the connection is not lose or knocked off and then check signal on it when cover is opened and closed, you may find the sensor needing to be replaced. Try resetting the unit first to see if that resolves the problem, this includes unplugging the unit as well.
Thank you!- Joe
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