The worst that can happen in my experience is damage to the chassis or knobs. Kemper doesn't hesitate to fix this stuff even if the unit's out-of-warranty, the only expense often being shipping.
The internals are super-spartan and tough-as-nails.
Also, non-Kemper owners aren't generally aware of the fact that these units run fanless-and-cool.
American computer (Mac), American DAW (DP), American audio & MIDI interfaces (MOTU), American guitars & basses, Kemper Rack, ROMplers