Are you experiencing difficulty unlocking your SDL-SG2 Smart Door Lock? Before you call for technical assistance, there are a few common issues to consider and steps you can take to resolve them yourself. Here's a comprehensive troubleshooting guide to help you get your smart lock back in working order.

1. Check Spindle Direction
   First things first, ensure that the spindle direction is set up correctly according to Section 4 and Section 5 of the user manual. The arrow on the spindle should be pointing in the same direction as your door handles. Incorrect spindle direction can prevent the lock from functioning properly.
   

2. Address Misalignments
   Misalignments between the lock and the mortise can often be the culprit behind unlocking issues with the SDL-SG2. Due to the precision required in installation, even minor misalignments can cause significant problems. Pay close attention to the following points:
   

• Precision Installation: The SDL-SG2 requires precise installation, especially if the mortise backset is small. A misalignment of just 5mm could prevent the clutch mechanism from engaging, resulting in the inability to unlock the smart lock.
  

• How to Determine Alignment: To ascertain whether your lock is aligned with the mortise, use a small level to ensure both are properly aligned. By leveling both the mortise and the lock, you can confirm whether they are in alignment or if adjustments are necessary.
  
  
  

• Potential Causes: Misalignments can occur with both door panels or just one. They may also occur randomly, even after prolonged periods of successful operation. Temporary Fixes: Sometimes, simply wiggling the handle or lifting it up and then down can temporarily resolve the issue. However, for a long-term solution, addressing the misalignment is crucial.
  

• Unexpected Misalignment: It's not uncommon for a lock that has been functioning correctly for some time to suddenly become misaligned. This can occur due to various factors, including changes in temperature, wear and tear, or adjustments made to the door.
  
  Diagnosing Misalignment

  Refer to the diagrams below to identify common misaligned installations that could be causing issues with unlocking your SDL-SG2:
  
  

3. Spindle Length
   In addition to misalignments, another potential cause of unlocking issues with the SDL-SG2 Smart Door Lock is the length of the spindle. The spindle, which connects the inner and outer door handles to the locking mechanism, must be the correct length for proper operation. Here's what to consider:
   

• Short Spindle: If the spindle is too short, it may not fully engage with the lock mechanism, preventing it from properly unlocking. This can occur if the spindle provided with the lock is not the appropriate size for your door thickness or handle configuration.

• Long Spindle: Conversely, if the spindle is too long, it may not allow the lock to fully disengage, resulting in difficulty unlocking the door. This can occur if the spindle extends too far into the lock mechanism, causing it to jam or become stuck.
  
  Diagnosing Spindle Length Issues

  To determine if the spindle length is the culprit behind your unlocking issues, visually inspect the spindle to ensure it extends far enough to properly engage with the locking mechanism without protruding excessively.

If problems persist despite your best efforts, don't hesitate to contact customer support for further assistance.