Precor Error Code 20

Error Code: 20

Manufacturer: Precor
Model: All Models

Error Description:

Error 20, Too many Maximum Power Requests in 1 Second - The error 20 observes a treadmill's power bit reading when the treadmill was operating at speeds of 1 mph or less.  Power bits indicate the relative time that the motor controller drive circuit is turned on.  Power bits is an indication of the amount of power the load is demanding from the motor controller.  Error 20 indicates that at a speed of 1 mile per hour or less, an excessive amount of power is being demanded from the motor controller for an excessive length of time.

 

Possible Reason:
  1. Starting the running belt under a very heavy load can cause the error 20 to appear.
    1. The user (especially a heavier user) is standing on the running belt as they start the belt into motion.
  2. A badly worn deck and/or running belt can cause the error to appear when the user steps onto the belt.
  3. Badly worn drive motor brushes may not be making proper contact with the drive motor commutator causing the error to occur when the user steps onto the running belt.  The unit may also slow down or become sluggish when the user steps onto the running belt.
  4. A leaky or shorted drive motor filter capacitor (on units equipped with SCR motor controller) could increase the current demand enough to cause the error.
  5. A leaky or shorted drive motor inductor (on units equipped with SCR motor controller) could increase the current demand enough to cause the error.
  6. The high power demand is caused by a shorted or de-magnetized drive motor.
Recommended Action:
  1. Instruct the user to straddle the running belt while starting the treadmill at a low speed, such as 1mph or less, and then step onto the running belt.
  2. Determine the amount of AC input current being drawn by the unit under no load and loaded conditions using a clamp on AC ammeter.  The current displayed can be used to determine the condition of the deck and/or running belt.  These same readings should be taken on a like unit, in good operating condition with a known good deck and running belt.  The readings from the unit in good operationg condition can be used as the benchmark.  Compare readings and replace* the deck and/or running belt if necessary.  *Some units have a reversible deck.  Be sure if the deck is being flipped or replaced, a new belt is installed on the new deck surface.*
  3. Inspect and repalce both drive motor brushes if necessary.
  4. Measure the AC input current without a load using a clamp on AC ammeter.  Electrically isolate the filter capacitor from the drive motor circuit.  The drive motor leads need be kept intact so the drive motor will operate with the filter capacitor removed from the circuit.  Re-measure the no load AC input.  If the AC input current is significantly lower, replace the filter capacitor.
  5. Measure the AC input current without a load using a clamp on AC ammeter.  Electrically isolate the inductor from the drive motor circuit.  The drive motor leads need be kept intact so the drive motor will operate with the inductor removed from the circuit.  Re-measure the no load AC input.  If the AC input current is significantly lower, replace the inductor.
  6. Swap the existing drive motor with a known good drive motor.