Precor Error Code 45 Lift Moving in the Wrong Direction

Mar 12, 2022

Applies to All machines with a lift actuator

Issue symptoms

The lift control system has detected the lift is moving in the opposite direction of the issued lift command. This error would happen when the lift was already in motion (typically downward) when a lift command in the opposite direction (lift upward) was issued. Some motors exhibited a very long turnaround time and the lift motor would still be moving in the original direction (downward) while the control system was attempting to move the lift in the opposite direction. Less likely but possible would be a defective motor controller.

Troubleshooting steps

1. Check that the MC is properly controlling the lift motor.
   1. Treadmills built before March 2014: Measure between the line filter brown wire and the red wire of the lift motor connector while pressing the up button in Diagnostics. There is AC line voltage when the motor is not being driven, and 0 Vac when the motor is being driven. Repeat the test with the black wire of the connector and the downward drive. If the MC is not switching properly, replace the MC.
   2. Treadmills build after March 2014: With a voltmeter reading AC volts, measure between the red wire of the lift motor connector and the blue lead of the line filter. You should read zero volts. Enter Diagnostics > Machine Test > Incline Test and move the lift upward. You should measure AC line voltage. Repeat the test with the black wire of the lift motor connector and the blue wire of the line filter. You should measure zero volts. Enter Diagnostics, and at the Incline Test, move the motor downward. You should see line voltage.
   3. EFX/AMT: Measure across the red and black wires of the connector and move the lift. You should measure 12 to 14 Vdc when the motor is moved upward and -12 to -14 VDC when the motor is moved downward.
2. If the Error 45 condition is persistent and the voltages from the controller are correct, replace the lift motor.
   1. Defective A/D potentiometer:
   2. Defective A/D potentiometer connections can cause a mix of Error 40s (lift not moving), Error 42s (lift out of range), and/or Error 45s (lift moving in wrong direction) event. An Error 45 almost always indicates the potentiometer has a bad internal motor connection. It is possible that the error log (or event log) will fill with Error 40s and 45s when it was actually a single event. Even after the cause of an Error 40 and 45 event has stopped, these errors will continue to be logged until the treadmill power is cycled OFF/ON. Error 42 will clear if the lift goes back within range limits. If the lift remains in an out-of-range condition, the error log will continue to fill with Error 42s with use. Replace the lift motor if these conditions are confirmed.
   3. The lift motor calibration will remain set to factory specification unless the lift motor has been replaced. If the equipment exhibits an out-of-calibration condition (e.g., the treadmill incline level is set to 0 but the running deck is not level) and the lift motor has not been replaced, it is most likely caused by defective A/D potentiometer connections. Replace the lift motor if these conditions are confirmed.