Dryer says check filter and it is clean - LG DLE2514 Electric Dryer

Air flow in the duct work is restricted... and the dryer sensor thinks that the filter is clogged.

You will need to take a fluffy cleaning wand and, with the filter removed, try loosening up some of the accumulated line in the duct.

Next, remove the lint pipe from the wall connector and try cleaning it and the pipe for as much distance as you can reach.

Finally, go outside and check the vent. It needs to be clean and clear of obstructions... also, needs to close when the machine is off.
You can do testing on the outside vent with "air dry" setting - hot air is not required... Keep cleaning ductwork until the outside vent passes air freely.

After air flow is restored, the sensor in the "VENT" alarm will act nice.....and stay off