There are cases where a treadmill will slow to a stop when you step on it and the combination of these problems could lead to a diagnosis as to the issue.
The treadmill mat stops when i step sometimes.
If the motor is too hot then the belt will not continue to turn.
A treadmill that stops running after starting the workout can mean something is wrong with the belt platform motor or speed controls.
If the roller and the pulley also stops then this is a clear indication that the drive belt is worn out.
The amp draw is close enough when not walking on the belt but the test is used at 3 mph drawing 3 amps.
Belt slippage will be inevitable if the drive belt between the motor and the front roller is slipping.
When you start walking it should go up but not that high 8 9 amps is a little high with a belt that has no friction.
Why my treadmill stops when i step on it.
If you step on the treadmill and its belt stops running but the motor is still running then you should check out the front roller.
When it stops if you step off the treadmill does the belt pick back up and run at the correct speed or does it stay stopped.
If you own a treadmill you understand that even the best exercise equipment sometimes has problems or issues.
Check the weight limit and lubrication and adjust the rollers if needed.
Unfortunately dealing with problems facing home exercise machines can be tricky and stressful.