Hello, Our Precor 9.21si begins slipping after walking or running a few minutes. Seems to be worse the faster you go. After about 1 mile, the house fuse blows. What troubleshooting steps do you thi

SOURCE: Precor M9.21 Treadmill - Stops under load

This probably did not happened suddenly right? the problem is not the motor however you can easily check the blue capacitor for peace of mind. with the power disconnected, disconnect one side off the capacitor from the top. with a ohm meter put the 2 probes on the cap,you will ear a temporary beep sound from your meter, then reverse your probes on the capacitor and again a temporary sound that mean your capacitor is good and your motor will run OK.

Your problem is more then likely your run belt and bed assembly. When new, these are coated with a wax of some kind for slipping, has you use the machine wax wears off, and so is the belt. You can see a black rubber dust at the rear of the machine. And so resistance increase when pressure is applied on the running belt.

Just behind the on/off switch where the power cord goes in, there is a auto reset 15 amp breaker that trips when too must resistance against the motor increase the amperage over 15amps. At 7 min/m on your speed setting and if the belt is adjusted correctly with nobody on, the motor pull about 6amps, with someone like me 180lbs, the motor pulls an avg of 10amps with a new belt.

If you have a clamp amp meter you can test it yourself.

2 parts you will need to fix this; 50985-101 (bed assembly) and 36355-101 (run belt 17 X 110) This is real easy to install.

make sure these parts are for your machine model # as they did increased the width of their belt over the years

Since 1998 I had to replace these parts 2 times with an average of 3 people using the treadmill every day. This is a good machine and if everything else is good it's worth it. I paid $300 for these parts, i'm sure if you shoppe a little you can do better.

Have a good one

Ben

SOURCE: c956 precor treadmill

Hi
not to sound funny but are you sure that you have this tread set in the units (mpg/kph) that you require. i have worked in loads of gyms and its a common problem that people think the belt is running to fast because its set in kph and that thinks its in miles eg 9mph = 14.5kph
you can check and change the units in the club setting menu.
hope this helps :)

SOURCE: wax or silicone on my 10+ year old Precor M9.21

Use silicone to lube your treadmill.

SOURCE: Just moved my precor c966i treadmill (we

it should be a cable that looks like an oversized telephone cable. I can't really tell by the description of the problem if you just can't remember where it plugs into or if you've lost it altogether. There will be a circuit board in the base of the treadmill that will have something that looks like a phone jack port on it. That's where it will plug into. There should only be one port on the lower board that will accept that style of plug.

Testimonial: "This is the exact answer to the problem--after much searching around, I finally found the little box it fit into. the treadmill is up and running. Thanks for your input."

SOURCE: The belt on my Precor

Error 22 means the drive motor is diconnected. you will hear the fan and other parts make noise but check the red and black anderson connection between the main circuit board and motor.