MERIT FITNESS - safety key t25t tm 6110807CM00398

The belt tension is fractionally too slack.

Check here for guidance on how replace or repair your safety key:
http://www.partsfortreadmill.com/parts-for-treadmill/treadmill-safety-key/
http://www.treadmillsrepair.co.uk/2014/08/treadmill-safety-key.html

Please Reset the C. breaker or see the fuse if has.
2) Please RETIGHT the connector coming from the Controller board Motor from the hood, UPPER lever where the console connector is there very well, See if there are some wires loose, or desolder, and cleaned very well.
3) If everything is right, TEST the 8-12Vdc to the Console Board. if there the Console Board is Faulty.
If there are NOT the Controller board is Faulty, and Replace, since some IGTBs is faulty.
LED Blink Patterns on the Control Board Treadmill
Blessing.
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THIS SOUNDS LIKE A DEAD MOTOR, TRY TROUBLESHOOTING THE MOTOR BY REMOVING THE MOTOR COVER AND REMOVING THE BELTS FROM THE MOTOR THEN TRY COMMANDING THE MOTOR TO ROTATE (USING THE CONTROL BOARD) IF IT STILL SLOACHES THEN THE MOTOR IS INDEED DEFFECTIVE.

I just found out I had lost my key too. I have a Merit 710T. I called the company and they directed me to their website.

http://store.horizonfitness.com/c-33-safety-keys.aspx

On the page there is a link to a chart which will tell you what key is right for your model. They are cheap, only @ $13. Not sure about S&H though. I've also heard that if the key is a magnet you MIGHT be able to use another magnet to complete the circuit. I'm going to try this when I get home to tide me over till I get my next check and order a new key.

You can get the manual on the link below. Just scroll down to product details then click on manual.

http://www.amazon.com/Horizon-Fitness-730T-Merit-Treadmill/dp/B000GVKBUW

Good Luck please rate 4 thumbs up and please leave a testimonial

Merit 725T. The treadmill has gone into a "10 degree" incline mode on its own, and will not respond to the control panel

Your unit has a direct short in the lower electronics call Merit @ 877-50-Merit

Sounds like the safety tether is not making contact with the switch make sure it firmly in place. Sometimes these switches will mis-align then the upper console would have to be removed usually held on by phillips screws and can be seen out of place