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Have you checked the filters and the dryer vent for clogs or obstructions?
did you go outside and see if air flow was adequate outside. Quite often flexable hoses and duct work get plugged with lint.
In the event that it is good as well then your problem is a defective light sensor and it will need to be replaced.
I believe you will find a clog some where in the duct work. That would be the only thing that makes sense unless something has got under the drum some how and is causing this error. You may need to take it apart to inspect it.
If the air is not getting out the vent and is blocked the sensor thinks the filter is clogged.And you will not get heat either.Check that the flexible vent line behind the dryer is not kinked or crushed.A simple way to check if the vent line leading out from the dryer to the out side of the house is clogged is to remove the vent line from the rear of the dryer.If the dryer gets hot when the vent line is removed, then the clog is between there and the outside vent door.
I will open this up to other experts to see if anyone else has any other ideas.