- The running belt and/or deck are badly worn.
- Bad lower PCA.
- The drive motor is shorted or de-magnetized causing a high power demand.
- Check the amp draw using a clamp-on AC volt-amp meter during loaded and no-load conditions and compare values to a similar treadmill that is known to have a good running belt and deck. Replace the belt and/or deck if necessary. Don't forget, some units have a double-sided deck which means it may be flipped over rather than replaced if it has an unused side.
- Test unit with a known good lower PCA. Replace lower PCA if necessary.
- Test unit with a known good drive motor. Replace the drive motor if necessary.
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