Golds Gym Treadmill inclines all the way & will not decline, if you switch the red and black wires it will decline all the way & not incline. I replaced the incline harness & the incline motor & same

You've to check the incline and decline limit switches also the incline motor
If you wish to get some details about treadmill repair and service ; check the site linked here. Pull up older posts.
http://electro-medical.blogspot.com/

Gold's Gym Treadmill Product Support ' ManualsOnline.com

fitness.manualsonline.com/support/golds-gym/treadmill/

My goldsgym treadmill just goes up and down when t. Gold's Gym ... my treadmill walking belt will not turn. ... Golds gym trainer 480 start button stopped working.

Repair Your Own Treadmill With Mark Peterson - YouTube

? 1:16
https://www.youtube.com/watch?v=B997gX07hW4
May 6, 2008 - Uploaded by Mark Peterson
A certified Fitness Specialist by the cooper clinic in Dallas, and a personal trainer for the first 16 years of my fitness career. .... I purchased a used Golds Gym Treadmill model# GGTL396100 which I tested when buying ... The treadmill will fully incline thennot go down, I have tried to recalibrate the incline ..

This happened to me as well. As wierd as this sounds, Rub/Massage all of your console keys well because believe it or not, they get stuck. While unplugged and without the magnetic key "inserted". Plug the machine back in and "insert" the key. Allow the machine to do the full incline and decline sequence if it decides to do so. Once this happens the machine should allow you to work the console buttons without any issues. At least this is how I was able to fix mine while on the phone with the Gold's Gym technical support. Hope it helps.

Sounds like the button on the panel is stuck somehow, I think this because when you switch the wires this would reverse the polarity to the incline motor.

can you tell if the panel is recognizing the pushing of the incline buttons, like with a beep or light or something? If it didn't seem like it's responding this may be because one button is constantly stuck down.

do you have the magnetic tag attached to you and the machine? it prevents operation unless its attached.

This problem needs more details to service....seem like you have multiple problems...better to call for service 877-805-1030

LUBE THE DECK BELT SEE THE VIDEO ATTACHED
2) RUN THE SOFTWARE CALIBRATION FOR EASY DIAGNOSE, TROUBLESHOOTING AND FIX IT. GO under the HOOD motor, and follow the steps.
God Bless you

my gold,s gym trainer 480 will ot run,everthing light up on console. could it be a fuse?

I have a Proform ZT5 model - had the same incline/decline problem. It needed calibrated.
- unplug, turn off, and take the key out
- plug machine in
- turn switch on
- Pres and hold the STOP and SPEED UP button at the same time, while holding them insert the RED KEY
- let go of both buttons
- press STOP 1 time
- pres INCLINE UP 1 time
- this should reset it.

The tech on the phone mentioned the importance of turning the maching off, taking the key out, and unplugging after each use. Leaving it plugged in there is still an electrical current running and this can cause more seriouc problems that require a new control panel.

Your owners manual describes how to perform an incline calibration. Here are the instructions.
Start the machine running. Press and hold the incline up button. While the numbers are changing, remove the safety key. Reinstall the safety key. The treadmill should rise to maximum incline, then lower to minimum. After completing the cycle, the treadmill should function correctly.
If not, you may have a damaged wiring harness (caused during assembly) or a defective incline sensor.
If the sensor is defective, you will need to replace the incline motor.