Error 44 - Un-Commanded Lift Motion; Error 45 - Lift Moving In Wrong Direction - Precor TRM 885.v2 Service Manual

The sum of the readings between terminals 4 (black) & 8 (white) and 3 (red) & 8 (white)
should total approximately 1kΩ (Ohms). If either reading is significantly high or open, replace
the lift motor.
NOTE: Readings While the Machine Is In the Home Position (Level)
 Potentiometer resistance black to red = approximately 1kΩ.
 Potentiometer resistance black to white = 20% of black to red (approximately 200Ω)
 Potentiometer voltage black to red = approximately 3.3 volts.
 Potentiometer voltage black to white = 20% of black to red (approximately 0.66 volts)
 A/D value = approximately 6800

Refer to the lift calibration procedure. If the lift position number and physical lift position
measurement does not correspond with the service manual, calibrate the lift motor.
Note: There must be a reason for the lift motor to be out of calibration, therefore simply
re-calibrating the lift motor will often not fix the problem.

If the lift calibration number (A/D value) is not 0 or 65535 and does not increment when the
lift motor moves, replace the lift motor.

If you have performed all of the procedures above and have been unable to correct the
problem, search for solutions in the service bulletins or call Precor customer service.

Error 44 - Un-commanded Lift Motion

MCL – Green
ASL – Blue Solid
Description
The lift control system has detected that the lift is in motion without a lift command having been
issued. This can happen in one of two ways: either the lift drive circuit has failed in a turned on
condition or the lift position sensor (potentiometer) is sending an erroneous signal to the lift
control circuit.
Possible Causes
1. Poor or intermittent connection in the lift potentiometer.
2. Bad Motor Controller.
Possible Remedies
1. Operate the lift in the diagnostics while monitoring the lift position number being displayed. If
the reading is erratic and makes large changes in readings the lift position potentiometer is
probably bad. Replace the lift motor.
2. If there is actual lift motion without a manual or program control lift command having been
issued, replace the Motor Controller.

Error 45 - Lift Moving in Wrong Direction

MCL – Yellow
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