Questions & Answers for: Keys Fitness trip light ups beeping

SI3 error on a very old Keys Milestone 1200. Error is shown immediately after unit is plugged in. I have the same problem. I just bought the 4200 used. I ran on it in the persons home and it worked ...

...light, do they stay lit. 3. if the unit does not trip off. insert the safety key. 4. note the lights again. your unit probably has a short on one of the control boards, and is over-current tripping ...