My e250 won't display

I need help! My son mx650 is charged, but won’t run. Put weight on it won’t move but lift rear tire off ground and runs full throttle

I have Blomberg WM87120 NBL00 Product code 717518110 and had flashing Lock in display. Bought and installed new lock and no change. Display still flashing lock. Used following procedure and every is working now.
Press pause button and hold down while turning off machine.Continue to hold pause button and turn power back on. If numbers come up on display make note of them for future reference. Release pause button and all lights on display will light up. Turn power off again and then turn back on. If machine was in a cycle it should end it and then return to normal operation. .Dont know if new lock made a difference. Try the reset procedure first.

Sounds like the control board is not communicating correctly with the rest of the unit, consult a professional.

On mine, I found that the battery contact springs on the inside of the control head (not the ones on the battery lid) were flattened out and were no longer making good contact with the batteries. I used a small hook to stretch them out a little so that they could make contact. As soon as I put the batteries back in I saw the display light up and now the bike works normally again.

Try resetting the device by pressing and holding down the Menu button for 15 seconds.

If that does not resolve the issue, then you may need to replace the battery in the device.

If the lights only stay on when key is in ignition, your central brake lights (or one of the lights) are out. The other lights stay on as a warning that the centrals(or other brake light/s) are needing replaced.

Camera

Turn off ignition. Press and hold the trip reset button, then turn the ignition on (don't start the engine), within 5 sec the SIA status will be displayed. Release the reset button. Press and hold the trip reset button for 5 sec, "rst" will be displayed. Release and re-press trip reset button.

The new status should be displayed.

The single most cause of no motor output is failure of the DC motor control Look for any test lights on the power boards beneath the motor shroud use caution when removing the motor hood because you may still have electricity in the motor area even if the treadmill is unplugged.
One of the lights should be labeled PWM when hitting the start button that will start flickering , because the upper console is sending a signal to the lower board telling it to start the motor. if that process happens then you need to check the motor
Cordless drill battery- get a fully-charged, 18 volt (preferred) cordless drill battery and on most treadmills connect the red and black motor leads to the battery (some have different colors but if you have two wires and get it hooked up backwards, the motor will just run backwards and won’t be harmed). If good, the motor should operate at about 1 MPH.
Car battery- these are 12VDC high amp batteries so the motor will turn slowly but you can walk on the belt. Always be careful with battery acid on these things so we don’t recommend bringing them in the house…take the treadmill to the battery. If does move then the controller board needs to be replace.

I believe this is answered already. Turn the hold button on. Red light will be on. Hold the rewind button while you insert it into the computer. Please search online this has been answered. I am recalling from what I read a few minutes ago.