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error Stanley
Error Code LED does not turn on
No battery power, implying the battery compartment may be empty or contacts corroded.
? What Causes This
Battery compartment is empty of batteries. Possible corrosion or incorrect installation of AAA batteries.
✓ How to Fix It
- Check that two high-quality new AAA batteries are correctly installed in the stud sensor according to polarities (+ and -).
- If in doubt, try replacing with fresh batteries.
Source: page 8 of the official manual
From the manual