Error 1 showes on panel

If the console lights up, but the treadmill won't start, the motor controller could be damaged. Loose wires under the motor hood or in the console can cause your treadmill not to start. Remove the screws and lift off the motor hood. Look around for any obvious damage, burns, loose or broken wires. The problem does not seem related to a blown fuse. But check your warranty first before opening something.
https://www.paradigmhw.com/

https://www.youtube.com/watch?v=a2FCo3JTO00
E02 error code: control board or motor issue. Test the motor first to check if the motor can runing normally. If motor is normal, replace the control board. E03 error code: 1,Turn on the treadmill , motor running a few seconds then stop and console board shows E03, probably the Speed sensor issue.
https://anytreadmillparts.com/pages/treadmill-error-code-troubleshooting

If you wish to get some details about treadmill error codes and repair; check the site linked here. Pull up older posts. http://electro-medical.blogspot.com/

Error 1: Speed sensor error Turn the power switch off and on again to reset the treadmill. If the treadmill returns to normal operation, you may continue to use the treadmill. If treadmill does not return to normal operation, then call the dealer for advice.
ERROR 1 CODE This is a safety feature that can stop the treadmill from functioning. This error can occur because the computer is not receiving the correct information from the speed sensor located near the motor. As a precaution the computer stops the treadmill until it begins to receive the correct feedback. By performing a few simple checks, the error can be cleared quickly and easily, and the treadmill can be ready for use. The treadmill does not move and displays "ERROR 1" Switch off the treadmill at the mains, and then switch it on again. If "ERROR 1" still shows switch off and push the running mat round (1 cycle) using your feet. Then switch back on. If "ERROR 1" still shows, then UNPLUG from the mains and check all of the wire connections made during the assembly. (SEE BOLD PRINT) UNPLUG If the treadmill still does not move, then please contact the helpdesk. Doing this may reset the program error, and the treadmill will be ready to use. This should reset the sensor, and the treadmill will be ready to use. Once the cables have been checked, turn on the treadmill again. This should eradicate the problem. 1. 2. 3. When assembling, there are several cables that need to be connected. It is very common for these cables to look like they are connected when they are in fact not fully connected. Make sure that these cables are connected as tightly as possible. The connections may have come apart whilst assembling the treadmill. here is a link to your treadmill web site http://www.yorkfitness.com.au/uploaded/pdf_71T520i%20Treadmill_5562.pdf

see the diagram attached for the speed sensor. test for open or faulty. clean it, and tight for plug or connector.
2) Test the input voltage motor, if there are the motor need repair
3) Test the output voltage board, for input voltage motor, if there are NOT the board is faulty.
God bless you

SimplerFASTERSolution So, I had the same problem. After removing the motor cover I checked everything out per earlier instructions. Everything looked great. Having been a software geek for as long as I've been running (35 years), I as inclined to believe this wasn't a hardware problem at all. It appeared to me that the system just needed to be recalibrated. So...here's what I did. I turned the treadmill on and selected the "Manual" program and hit "Start". The monitor, as usual, counted down 3-2-1. As soon as the rollers started to move I hit the "Slow" button on the right upright several times so I knew that the treadmill was running at it's slowest speed. I then started walking on the belt. I started tapping the "Fast" button and let the belt gradually increase in speed and took it up to 6.0. No problem! But...nobody wants to start each workout that slowly. I had a hunch it was 'fixed'. So, I stopped the treadmill and turned everything off. I started it again, selected "Manual", immediately hit the "2" then he "4" then the "6" on the right hand "Speed" panel, and it ran like new. No service call, no new speed sensor, no fiddling with the little 'diode', etc. Give this a try first...no need to even remove the motor cover. Best of luck!

That error code mean you motor is not getting the correct signal to operate the drive motor. You will need unplug unit then take the motor shroud off visually inspect all connectors then make sure all of them are seating solid in their connectors. then plug the unit in check an see if the L E Ds have lit on lower electronics board then get on unit and with your foot proceed to move the belt while doing that hit your start button and see if that error code come up. At this point we are checking the speed sensor to see if it is functional. Now if your upper console is registering its showing speed and time moving forward this also tells us that the communication between the two boards are fine. Now stop this process and you should have the error 1 show on the console. If you have a multi meter handy find the two leads coming form the motor going to the board unplug them put the two leads into the connector switch the meter to dcv 100v range and proceed to move the belt in the previous now the motor has become a generator and if function you should be getting a dcv output if not the it telling either worn motor brushes or open winding in the motor now if you get a reading then that lower board is defective. Then call York and get pricing on the defective part.

hi, Plaese check the Power point

hai,
error4, display board maybe not fine

Trimline treadmill starts up then code E2 comes up, and the display shuts down. 
Any ideas???