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Either the walk belt is loose or the front roller pully has spun. In order to determine which one, you need to remove the moter cover and watch the drive belt and front roller while you walk, try to stop the belt and see which one stops. If the walk belt stops and the front drive roller keeps turning, then you need to put a couple of turns on the rear allen bolts. If the roller stops when the walk belt stops, see if the drive belt(small one going to the motor) stops as well. If the drive belt turns fine,but the walk belt and the front roller stop, you need to replace the front roller, because the plastic pully that is connected to the roller, is pressed on and cannot be tightened.
1. Unplug the treadmill and remove the motor hood.
2. Use a permanent marker like a Sharpie and mark the roller positions on the bolt on the front roller and bolts on the rear roller- not all front rollers have this adjustment bolt.
3. Loosen the walking belt at the rear of the treadmill.
4. Remove the front roller adjustment bolt.
5. Some higher end treadmills use straddle covers that have an undermount or slide mount. If you don't see staples or bolts on the top of the cover, do not pry them up. If you do have one stapled or screwed down, use a flat head screwdriver or similar instrument, pop the plastic deck cover on the right hand side up (if you are standing on the treadmill like you are using it, the deck cover on the right side). If you see screws, simply unscrew and remove the screws. Screws are included to reattach the cover near the end of installation.
6. Remove the deck bolts…most have 3 or 4 bolts.
7. Once the deck is loose on the right side, completely remove the screws from the rear roller. Be careful with the plastic endcaps. The endcaps and the roller need to be removed in this step.
8. One person should hold the deck up and hold the front roller in position near the pulley while a second person removes the old walking belt (some models that do not fold and a very few number that do have a side handrail on the right side that attaches at the base of the treadmill…if yours does, remove this handrail before removing the belt). If you are talented, you can do this with a single person.
9. With one person holding the deck up and holding the front roller in position near the pulley, the second person should reinstall the new walking belt. Once the belt is in place, raise the deck up again and look underneath to make sure the belt is in the center of the belt guides that stick down from the deck underside. When tensioned, the belt guides should make the outside edges of the walking belt turn toward the center of the belt.
10. Replace the rear endcaps and rear roller and start the rear roller bolts. DO NOT TIGHTEN THE REAR ROLLER BOLTS IN THIS STEP.
11. Refasten the deck bolts. Go ahead and tighten the deck bolts fully in this step.
12. Refasten the front roller bolt and return it to the marked position (it was marked in step 2).
13. Replace if you have undermount straddle covers or fasten the plastic side deck cover with the enclosed screws if yours were screwed or stapled down. Removing the staples in the deck with a pair of pliers before reattaching the deck cover is not required but will make it easier to reattach.
14. Retighten the walking belt to the marked positions on the rear roller bolts.
15. Check the walking belt for proper tension by lifting it 2” to 3” in the center of the belt.
16. Test the treadmill for slippage and make adjustments (if needed) for lateral centering or tracking.
17. Once the belt tests good, replace the motor hood.
You don't mention what type of sensor. I assume it is a motion detector. Before replacing I would strongly suggest you first remove all power from the system by disconnecting the backup battery inside the control panel then pull the system's power transformer which should be plugged into an electrical outlet nearby. You will know that all power is removed by looking at the keypad - all lights on the display are off. Next remove the motion detector's front cover. Some detectors have a small screw on the bottom so that when removed the cover pops off. Others need to be opened using a flat blade screwdriver and prying off the cover. Once the cover is removed there should be a 4 conductor wire that is wired to a series of terminals. Observe the polarity of the wires, disconnect them and remove wall mounting screws. Install new unit. Be sure when wiring to connect power wires correctly. The 4 conductor wire should have a red (positive) wire and a black (negative) one. Connect the red to the + or pos terminal and the black to the - or neg terminal. Read the instructions that came with the new unit if in doubt. When finished plug the power transfomer back in then reconnect the battery (in this order). If power is connected properly the motion detector's red walk test light (indicating motion) should light whenever you walk in the protected area. Also make sure the system recognizes motion by first closing all protected areas such as windows and doors to get a system ready or green light indication on your keyad, then walk around the protected area. A properly working detector will show you a fault on the keypad everytime the system senses motion.
First thing to check is to see if the optics are working properly. This is the red flashing light on right hand side of freezer wall. Close the flipper door, be sure not to block the beam, and the light should go to solid red. If it does then the optics are ok. If it continues to blink then that is your problem. If optics check ok then pull ice maker out and remove the white plastic cover. It just pulls off. Look at the center of the gear wheel and see if one of the plastic tabs is either broken or if they are sort of twisted and touching eachother. If any of these things with the gear have happened then that module will need to be replaced along with the ice maker thermostat. If your not sure how to replace these parts then just replace the whole ice maker. That is much easier and not much more costly.
After changing the parts or the ice maker out follow these steps to start the ice maker thru a cycle. 1. Remove the ice maker from the cradle but leave the harness connected. Remove the front cover from the module. Unplug the refrigerator. Get a small jumper wire with bare ends and jump T and H on the module, leave the jumper in and set the ice maker on the shelf. Close the door. Now plug the refer back in and wait 30 seconds. Open the door and the ice-maker should be cycling. Remove the jumper, put the module cover back on and set it back in the cradle. The fill should take place when the ejector blades reach the 12:00 position. Follow these steps exactly in order