Fenix LR40R Troubleshooting StepsUpdated 3 hours ago

Confirm that your batteries are good. Try using the battery in another device. Confirm that the batteries are inserted into the light facing the correct directions. 2 batteries should go in positive (+) side toward the head (LED) and 2 should go in negative (-) side down, as indicated on the inside of the flashlight. Confirm that there is only one o-ring on the light. The o-ring that comes in the box is a spare. The light already has an o-ring on it when you first remove it from the box. If you put on the spare o-ring, please remove it as this will prevent the light from making a full connection with the batteries. Lubricate the o-ring using a small amount of petroleum jelly on the end of a cotton swab. Confirm that the tail cap piece is completely tight on the body of the flashlight. Click and hold the power switch for .5 seconds. A single click will not turn the light on, you must hold the button down. The rotation ring can become very tight and may be difficult to turn after not being used for a while. However, once you turn it the ring should "loosen up" again. After you have completed the above troubleshooting steps, if your light is still not working, visit our Warranty and Repair page (https://fenix-store.com/pages/warranty-info) to review the policy and submit a claim.