Question about Precor Treadmill 9.21 9.21s 9.25 9.21si 9.25 Replacement Motor Hood Cover

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Belt stopped and showed message ERR22

Was adjusting belt speed and it suddenly stopped.The screen showed a ERR22 message.

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Precor Error Code 22 Error Code: 22 Manufacturer: Precor
Model: All Models
Error Description: Error 22, No Motor Pulses at Start Up - Error indicates that the display has sent a command for the drive motor to start, however, the speed sensor has not returned the signal acknowledging that the drive motor has started. Possible Reason:

  1. The line of sight between the speed sensor and the speed sensor target is obstructed.
  2. Badly worn drive motor brushes.
  3. Incorrect gap between the speed sensor and the speed sensor target.
  4. Incorrect adjustment of the speed sensor potentiometer (when equipped).
  5. Inoperative speed sensor.
  6. Faulty lower PCA.
  7. Faulty interconnect cable between upper and lower PCA.
  8. Faulty upper PCA.
Recommended Action:
  1. Using a static safe vacuum cleaner, carefully vacuum out the drive motor compartment. Be sure to thoroughly clean the area between the speed sensor and the speed sensor target.
  2. Bady worn drive motor brushes cannot make proper contact with the motor commutator, therefore the drive motor will not start when voltage is applied. Inspect and replace drive motor brushes if necessary.
  3. Inspect the gap of the speed sensor to the speed sensor target. Proper gap is 3/16" and the speed sensor photo eye should be aimed at the larger portion of the targets wedge shaped section. If unit has a magnetic speed sensor, the gap between the end of the sensor and the flywheel tooth needs to be 3/16".
  4. Locate the speed sensor potentiometer (when equipped) on the lower PCA. Set the speed sensor potentiometer to mid-range. Start the treadmill and increase speed to 6 mph. Carefully adjust the speed sensor potentiometer until the treadmill is operating the smoothest. Increase the speed to full speed and again adjust the speed sensor potentiometer until the treadmill is operating the smoothest. These two adjustments are typically small and are generally only a matter of fine tuning.
  5. An inoperative speed sensor will allow the drive motor to start and run briefly before the error appears. If able to access the speed sensor wiring, measure the DC voltage between the speed sensor leads. Two of the leads will always read about 5 VDC. Two will toggle between 0 and 5 VDC as you slowly turn the speed sensor target. If both measurements are not seen, the speed sensor needs replaced. Some units have the speed sensor mounted on the lower PCA and the lower PCA needs replaced.
  6. Determine if the lower PCA is bad by swapping with a known good lower PCA.
  7. Determine if the interconnect cable is bad by swapping with a know good cable.
  8. Determine if the upper PCA is bad by swapping with a know good upper PCA.
Precor Error Code 22

Posted on Jul 08, 2014


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SOURCE: I have a M9.41si -

The belt is erratic ,This indicates problem with DC board or the motor. Manually push the belt in the direction in which it normally moves. If you have difficulty turning the belt, there may be an issue with the belt/deck friction. If the belt turns freely, there may be an issue with the DC board output.
Use a multimeter to test the black and red lead wires that connect the motor to the power supply. An external power cord connects the motor the power supply.
Most probably its a motor issue.Its got weak,because in most of the cases its seen.But in some cases the board is checked faulty.-------- Get the motor as well as board checked to confirm the fault.
This will help.Thanks.Helpmech.

Posted on Jan 23, 2011

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Step 1:

ERR 1 - Motor Movement

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Dear Sir:
I can read you trouble, and follow the next steps:
The correct alignment of the running belt is critical to the smooth operation of the treadmill. The belt is properly aligned at the factory. However, during shipping and handling or by use on an uneven surface, the belt may move off center and require a few simple adjustments. Before aligning the running belt, check its operation by following the procedure in Checking the Alignment of the Running Belt. If you determine that the belt needs alignment, follow the instructions here. CAUTION: Special care must be taken when aligning the running belt. Turn OFF the treadmill while adjusting or working near the rear roller. Remove any loose clothing and tie back your hair. Be very careful to keep your finger or any other object clear of the belt and rollers, especially in front of the roller and behind the deck. The treadmill will not stop immediately if an object becomes caught in the belt or rollers. Realigning the belt takes a few simple adjustments. If you are unsure about this procedure, call Precor Customer Support (see Obtaining Service.) Take the following steps to align the running belt on the treadmill. To ensure your safety, make all adjustments while the treadmill is OFF. 1. Make sure the treadmill is OFF and the running belt has completely stopped. 2. Locate the right belt adjustment bolt in the rear end cap of the treadmill. (To determine left and right, stand at the rear of the treadmill and face the display.) See Diagram 24. The direction you turn the bolt depends on how the belt is tracking. Make all belt adjustments on the right rear corner bolt using the hex key provided. • If the belt is off center to the RIGHT, turn the adjusting bolt ¼ turn clockwise, which moves the running belt to the left. • If the belt tracks off center to the LEFT, turn the bolt ¼ turn counterclockwise; this moves the belt to the right. Important: Do not turn the adjusting bolt more than ¼ turn at a time. Overtightening the bolt can damage the treadmill. 3. Turn the unit ON. 4. Stand beside the treadmill and press QUICKSTART. 5. If you are prompted for a password, press INCLINE ??¼, SPEED ??¼, SPEED ??². The running belt starts automatically after the 3-second countdown appears on the display. 6. Press the SPEED ??² key until the display shows a speed of 3 mph (5 kph). 7. Walk around to the rear of the unit and observe the running belt for a few minutes. The belt should run centered along the running bed. If the belt drifts off center, you will need to make adjustments. CAUTION: If you hear any chafing or the running belt appears to be getting damaged, stop the running belt immediately by pressing the red STOP button. Contact Precor Customer Support. 8. If the belt needs additional alignment, repeat steps 1 through 7 until the belt is properly aligned. 9. After aligning the belt, press the STOP button and RESET. Turn OFF the treadmill. Tighten any loose fasteners or other components on the equipment. If you hear unusual noises or you feel that the treadmill is in need of repair or service, contact Precor Customer Support. Refer to Obtaining Service.
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