Tobacco remains in the cap
Perhaps some tobacco from a previously used HEETS tobacco stick became stuck in the cap. In this case, remove the tobacco residue using an IQOS cleaning stick or perform complete cleaning.
Tobacco stick compressed to much
Sometimes the tobacco in a HEETS tobacco stick is compressed a little stronger.
Cold heating rod
It is also helpful to preheat the heating rod and only insert the HEETS tobacco stick around 5 seconds after the heating phase has started. This makes it easier to insert the tobacco stick into the holder.
Important: The heating blade in the holder is very sensitive. Always proceed with caution.