Adjust the REED switch, see the diagram for to do it. clean, and tight the connector very well.
God bless you
SOURCE: Proform Crosswalk Dual Motion Cross Trainer
I think you are talking about the front roller. It has a rubber sleeve that helps to grip the walking belt. Sometimes you can tighten this enough to keep it from slipping but you run the risk of overtightening and damaging both rollers. We recomend replacing that roller.
SOURCE: Proform Crosswalk Advanced 525X
One possibility is the pulley in the front roller.The shaft that goes into the roller slips making the belt seem as if its slipping. To check it it requires tmarking both surfaces with paint and then see if the mark seperates.
SOURCE: After replacing batteries on Proform PF800 console stays lit
Pull the batteries out let it reset itself while its doing that check all cable to make the connection are seated firmly then reinstall the batteries, unless the function pad is sending a phantom signal engaging the display to be on continuously,or by pure chance the upper electronics went hay wire
Testimonial: "Thank you very much for your advice! Very helpful!!"
SOURCE: belt won't move
does is just not move when you're standing on it, or not even move when you're not standing on it. It may be a simple belt adjustment or if the motor is running but there's no track movement you may be looking at a loose/broken drive belt. Take the cover off, start it up and look at the motor/drive pulley assembly. If the motor turns and the front roller doesn't, tension the drive motor by moving it back. If the front roller turns but the track doesnt, do a track adjustment as per your users manual.
SOURCE: My proform 515s Crosswalk treadmill works for a
1. Inspect belt and deck. The deck should be smooth. The belt should have a consistent feel from side to side (a belt can be worn out without any sensory signs of a problem). If you feel deep grooves in the deck or uneven wear on the underside of the belt, part replacement is necessary. Continued use of your treadmill may damage expensive electrical components. 2. To inspect the belt and deck visually or to clean underneath the belt before applying lubricant, the belt must have the tension reduced. Loosen the tension roller by following the instructions in your owner’s manual. Do not loosen the bolts in the tension roller too far or the bolts will come out of the roller shaft. This step may not be necessary for your treadmill model or belt and deck condition. 3. Contaminants are the worst enemy of your belt and deck. Some treadmills may have an excessive accumulation of dirt and contaminants. If these are trapped during the belt lube process, significant damage will occur. If contaminant removal is necessary, loosen the belt by following step 2, lay the treadmill on its’ side, and use a nylon brush to loosen contaminants that have accumulated on the inside of the belt. Clean the deck with mineral spirits in a well-ventilated area. Allow the deck to dry before lubing or tightening the belt. 4. After completing the steps above go to your local hardware store and purchase a can of silicone spray ( Pyroil, Napa etc ) attach the nozzle and proceed to spray length wise starting at the motor shroud to 2/3 down the deck repeat the process on the other side then re-tension the belt according to you owner's manual. Start unit and proceed to walk on it if the unit shuts down again then belt and deck needs to be replaced or your in the market for a new treadmill.
If after you did these adjustments Not work, replace the sensors.
TIGHT EVERY CONNECTION BETWEEN CONSOLE BOARD AND CONTROLLER BOARD, LOOSE CONNECTION, BAD CONTACT,CLEAN CONTACT SPECIAL SPRAY CONTACT CLEANER, 
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