The incline moter on my TX455 treadmill does not work?

I recently moved my TX455 to another room and now the incline motor does not work I placed it on top of a 1/2 thick piece of plywood because the room has carpet,but when I am attempting to set the incline the readout gets a E-5 error and wil not allow me to program the incline, I ran a pre-program from the factory about 20 min. but every time the incline was supposed to rise it would get the e-5 error.The instruction manual said if this happens let it cool off but I tried that with no success.