It is a precor 9.2s model treadmill and it won't incline (either on program or on manual setting). it still works other than the incline. we checked 2 fuses, one had no resistance and the other had some resistance but not infinite. we also checked a couple of connections and they seemed firmly seated. we are looking for a service manual so we can figure out what the correct voltage on the plug connector is to see if its activating the motor or not.

SOURCE: ???maximum user weight for Precor 9.45i

Normally most home treadmills are 250-300lb user capacity.
Call Precor with your model # and S/N and they can tell you exactly.

SOURCE: Precor 9.4 Treadmill Incline Problem

http://www.youtube.com/watch?v=MIIxoPtvhy8

I bought a used Precor 9.4 treadmill, but the incline adjustment was not working.
So, I did the following.
1. Turn off, unplug the treadmill and wait for an hour (this is for safety
2. Remove the black motor cover
3. Observe the transformer to the right of the motor and towards the belt ( I point to it in the video)
This transformer converts DC electricity to AC electricity and the AC current goes directly to the Incline motor which is in the black box towards the front of the machine.
4. On mine the wires had come loose from the transformer, they were soldered on very poorly, the wires are stiff and you should be able to see 4 wires coming from the top of the circuit board and plugging into the transformer, I had three of the 4 wires loose.
5. If you are not comfortable working with electronics or soldering DO NOT DO THIS REPAIR, you could get shocked very badly if you just go poking around in there with metal objects, get a friend who knows how to solder or hire someone.

6. It took about 5 minutes I just heated up my $10 soldering gun from radio shack and soldered all the loose wires that were about a millimeter away from the tabs on the back of the transformer, and VOILA! The incline now works!

SOURCE: Proform 740CS runs okay but the incline does not

ProForm Treadmills have a reset procedure for the incline function. With the key inserted in the console, activate the incline; while the incline is changing, remove the key. Wait 30 seconds, then replace the key. The incline should to maximum, then to minimum, resetting its limits. It worked for mine just 10 minutes ago; the procedure is in the manual if you have it. Good luck!

SOURCE: Freemotion treadmill incline not going all the way

The problem is either in the lower control board or the lift motor. I would start by replacing the lift motor. Then if that does not fix it, replace the lower control board.