Labeler Fault — No Label Detected

What This Fault Means

A no-label-detected fault means the label sensor did not detect a label passing through within the expected time window. The machine stops to prevent unlabeled product from passing downstream.

Common Causes

• Label roll ran out or loaded incorrectly
• Label sensor dirty or misaligned
• Label gap or black mark not matching sensor type (gap vs. mark sensor)
• Web broken between the unwind and the peel plate
• Label adhesive buildup on the peel plate preventing clean separation

Recommended Fix

1. Check the label supply — reload if empty.
2. Clean the label sensor lens with a dry cloth.
3. Verify the sensor type matches the label style: gap sensor for clear-gap labels, mark sensor for black-mark labels.
4. Re-thread the web through the peel plate and applicator.
5. Clean adhesive residue from the peel plate edge with isopropyl alcohol.