I saw a series of posts where people were having the "condensation error" on their JVC GR-D22U camcorder. I am having the same problem, and have been for about 1 year.
I saw one "fix" that recommends taking out the tape and cleaning the black coating off the sensor inside the tape compartment with a damp q-tip. I tried it and it worked for about 5 minutes.
Last year I read a procedure that involved undoing all the screws to open up the camera and unplugging something inside, but now I can't find that set of directions online. Now that my warranty is expired I have nothing to lose - except all the video I've shot thus far!!
I hope you can help!