I had the exact same problem with my treadmill running full speed for about a second and then shutting off. I followed this post, found the MOSFET, and replaced it. Treadmill now works great. Thank you for the post.Looks like the MOSFET was the problem. I also lubricated the deck under the belt. After it started running, it would slow down when you stepped on the belt. It still does a little at very low speeds of 1 mph and under.
Sorry to revive this thread, but my issue is as you first state (runaway start, dimming lights, and stop - display and election still work). Somehow that is not addressed anywhere else I could find... you obviously have seen this before. Thoughts?Does it start in high speed, or start to ramp up as it should?
I have 3 versions here, one of them a REV B. There is no temp sensor, just the CB1A/B for O/L switch.
And a MOV1 next to it, that is across the supply, so don't short that out.
Max.
Yeah that's what I thought too. Thanks that should help narrow my troubleshooting.Sounds like a shorted Mosfet /BJT.
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