Precor Error Code 25

Error Description

Error 25, Motor Pulse Count over Acceptable Limit - Observation of the power bit reading.  Power bits indicate the relative time that the motor controller drive circuit is turned on.  Power bits are an indication of the amount of power the load is demanding from the motor controller.  The treadmill software sets a maximum allowable power bit limit.  Error 25 indicates that the maximum power bit limit is being exceeded.

Probable Cause

1. A badly worn deck and/or running belt.
2. 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.
3. A leaky or shorted drive motor inductor (on units equipped with SCR motor controller) could increase the current demand enough to cause the error.
4. The high power demand is caused by a shorted or de-magnetized drive motor.

Corrective Action

1. 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 know good deck and running belt.  The readings from the unit in good operating 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.*
2. 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 to 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.
3. 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 to 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.
4. Swap the existing drive motor with a known good drive motor.