we have installed two controllers due to believing it was a controller problem as by the controller rebuilders. original problem was little to no travel and no codes, constant testing caused controller to overheat- gave code 41. called hyster ,they came in and hookup laptop,cleared the 41 code and saw that motor was pulling 650 to 700 amps, I pulled the motor sent it out to a rebuilder. Was told that motor was shorted due to junk built up inside motor. rebuilder sent it back stating it tested fine once it was cleaned out. I reinstalled the motor,test ran - no change-little to no travel. another tech said the encoder was an issue so I disaasseembled the motor and replaced the encoder,reassembled and test drove,got the 52 code this morning, i hooked up the original encoder and no more 52 so I just pulled it apart and found wiring to encoder had moved and had been cut in two by motor head. I've just repaired wiring to encoder but haven't install it yet. I did troubleshoot the 52 code by using the old encoder and the lift went back to little to no travel, no codes so I believe that the encoder is not our problem but I'm at a loss at what it could be.