Report "I have a pro form GR 80 that isn't working right. It won't power off and instead will continue to read 1.00 or E until the batteries die. If I take the batteries out and reset the fan comes on briefly before the error message. Somtimes it will work correctly for 2 minutes before the error sign comes up. I've taken it all apart and no lose wires or obvious flaws. Any guidance would be helpfu"