MC60 motor controller slows under load

Thread Starter


Joined Feb 6, 2014
My daughter spilled water on our treadmill (had the cover off with a fan on it to keep it from cutting out on over current). I unplugged it and let it dry out, but something got cooked in the process. It runs fine now (at any speed) until I get on it, and then is slows down (current limit LED lights up) and never recovers until I get off of it. I used the troubleshooting information on the back of the schematic that came with it, and all the LEDs function as they should.

I read a bunch of posts on here, and found a schematic and circuit description.....replace U1, since it provides the feedback to raise the voltage to the motor, but still no luck. I checked what I could, but many of the component numbers cannot be seen. Anybody have any suggestions?




Joined Feb 3, 2014
Where exactly did the water go? Could it be something else that might be affected by water? How long did you let it dry out? Did you open up panels to let air get inside?


Joined Jul 18, 2013
Sounds like you had troubles previously if you had to keep it cool with a fan?
I would be looking for loading/friction problems?