Treadmill Reed Switch Failure – Speed Detection Problems
Learn how a treadmill reed switch works and what causes it to fail. Our guide helps you troubleshoot speed detection problems caused by this common sensor.
How a Reed Switch and Magnet Work
A simple explanation of the reed switch: a small glass tube with two metal contacts that are pulled together by a magnetic field, completing a circuit each time the roller magnet passes by.
Common Causes of Reed Switch Failure
The glass can crack from vibration, the contacts can get stuck together, or the magnet on the roller pulley can fall off. Misalignment is also a very common issue.
Troubleshooting Steps
- Check for the magnet on the pulley. 2. Check the alignment and gap (1-3mm). 3. Inspect the switch for visible cracks. 4. Check the wire connections.
Testing a Reed Switch
A technician can test the switch for continuity with a multimeter, listening for a beep each time a magnet is passed over it.