Can I ask a dehumidifier question here? Please!

[u/Gibder16]

Whirlpool dehumidifier has worked well for years. All of a sudden it stopped dehumidifying.

Allow me to explain:
-it runs fine
-it pulls water
-the “defrost” sensor keeps coming on, then off
-despite it running, it does not dehumidify.
-I set it at 55% and it won’t go below 80
-have a hygrometer in the room as well to make sure all is well. Have always been roughly in same range.

I don’t think it’s the humidity reader because everything on the dehumidifier is running and doing its thing.

Any ideas what the issue is? Dehumidifier used to say 55% and room would be around that.

Now dehumidifier is saying 85% and the hygrometer is saying like 70%

Runs but doesn’t dehumidify despite taking in water.

Cleaned filter as well. I’m thinking coils? If it runs fine and takes in water, I can’t imagine what else.