Step 1: Rotate the Thread Sensor tube a full 360°.
Step 2: Make sure the foam ring along the side is not crimped inside the bracket.
Step 3: Make sure that the thread guide (the plate with 48 holes that the thread feeds through) directly above the thread sensor is completely level and parallel to the thread sensor…it shouldn’t be higher on one side than the other.
Note: It is not advised to trim the foam pad.
If none of the above helps, contact Melco Technical Support for in-warranty service, or visit www.shopmelco.com to purchase a replacement Thread Sensor if your machine is out of warranty.