Question about Nautilus Sport 5.18 LC Treadmill - Huge Savings & Free Silver Service Deliv

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T518 keeps shutting off

Nautilus has sent new wiring for the display panel, new wiring from the display panel to the control board, a new power cord and a new control board and yet it still dies within 5 minutes. With all the back and forth with Nuatilus it has already been out of commision for 2 1/2 months. They seem to be just guessing. They even sent a new motor; however, it did not fit my machine. Any suggestions?

I found this posting on Amazon and it sounds very similar:

The internal circuit breaker would flip and the power would cut out.

The retail store sent out a repair guy and determined the transformer was overheating. They ordered a new controller board from Nautilus. Three weeks later the part finally arrived and the service guy installed it. After running on it for 5 minutes the same problem happened.

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Hello. I'm actually the guy who posted the bad review on for this product.

Here's an update: The repair guy said over-lubrication MIGHT have been the problem. Since I had bought the machine I was lubricating per the schedule in the manual. The repair guy said that was too much and to only lubrciate every 200 miles or so.

After replacing the controller board AND the internal circuit breaker on the machine it worked OK... for another 5 months. Just tonight I was running on it and it shut down on me. Its the same symptom as before. The motor itself does not appear to be overheating (its cool to the touch). The controller board, however, is extremely hot right after it shuts down.

I called the retail store and they are going to call Nautilus to see what they should do. I do NOT recommend this model or even this manufacturer.

If anyone finds out the solution to this problem PLEASE post here.


Posted on Jul 07, 2010

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Did anyone address the issue of lubrication for the unit since the increase of friction will overheat components thus causing the unit to shut down.

Posted on May 10, 2010

  • John Mazmanian
    John Mazmanian Jul 12, 2010

    Measure on the hot DC lead (usually red) going from the controller to the drive motor. If you have a simple multi-meter with a DC amp test setting the best way to test is to put the meter inline on the red motor lead with alligator clips. If you have a more expensive clamp meter, clamp the meter around the red motor wire. Run the machine at 2.5 MPH without a person on the belt. If the motor and drive system are healthy, you should have a reading in the 2-3 amp range. Then walk on the treadmill at the same speed. With a person of average size (around 200 lbs.) you should have a reading in the 6-8 amp range if the belt is good. The readings will fluctuate more with a load but you are looking for an average reading but you shouldn't see spikes above 10 amps. If the amp readings are high without a load, you could have a problem with high resistance in the motor, a bad bearing, or over-tightened belts. Regular readings without a load but high readings with a load indicate a worn belt and/or deck.



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