Nearly all gurgling and leaks are caused by liquid in the airflow, to clear this, flick the device sharply a few times (fig.10), if this does not fix the issue:
• Coil needs replaced: If the coil is old (more than 7 fills), replace it.
• Base needs cleaned: Remove and check there is not excess eliquid in it, if so clean out
If the tank is not gurgling, but leaking (liquid flooding out):
• Check the coil is screwed in correctly
• If the leak is coming from around the window, contact customer service.
• If in doubt, contact customer service.