The treadmill turns on but stops after 3/5 seconds, with an acoustic
signal and/or an error code displayed. After restarting it, the same
thing happens. It seems that the treadmill controller detects
something abnormal, therefore it stops as a safety measure. You
should immediately check the speed sensor, which is often the cause
of this anomaly. This sensor checks the engine or the belt speed. The
controller get the information that the engine is powered, but it
doesn’t spin. Or it’s powered, but running belt does not turn.
In our case the belt and the motor spin regularly, but the speed
sensor doesn't sends signals because it has failed. If the sensor is
magnetic, sometimes it is too far from the pulley and does not detect
it. Magnetic sensor should be within 2/3 mm from the pulley. If the
sensor is optical, make sure that you have not accumulated dirt on
the optical emitter/receiver.
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