If you encounter a "check atomizer" message on your VooPoo Drag, try the following troubleshooting steps: Ensure that the atomizer or coil is securely screwed into the 510 connection. Check the coil for damage or wear and replace it if necessary. Clean the 510 connection on both the mod and the atomizer to ensure a good connection. Make sure that the atomizer is compatible with the VooPoo Drag's wattage range. Ensure that the mod is powered on and has sufficient battery life.