Your Cupti is gurgling, spitting and changing the coil does not fix the issue?
It is very common to overfill the tank of the Cupti, and sometimes when doing so, some liquid will find its way to the inside of the wall of the stem and stay trapped there.
We have dealt with this problem in 2 different ways. The objective is to clean the inside of the metal wall of the stem.
1.- Unscrew the stem and unscrew the coil from the stem
2.- Open the airflow valve and wrap a napkin o