Unable to Load / Unload filament

Hi,

I am running a 1.0 A with E3D, Original firmware and Simplify3D.

It's been going well the last weeks, and still I am able o print, but I can't load or unlaod filament anymore (by menu).
Wanted to try TPE-Filament. So I put in one original TPE-Cartridge.
It heats up to 225 C and then nothing more happens.
I switches on and off several times but always the same.
Finally I changed back to my PLA-Cartridge, resetted (using 3rd party filament). Still the same.
When I start a print, all works fine. Heats up to 195 C and then starts printing.

Anyone any idea what is causing this?

Uli