Thanks for the video. Had the same issue. Straight to the contacts to clean. Working perfectly again.

Exellent video! I have a K5 premium and same issues, it does turn auto off, but slowly, and then not back on again as soon as pistol is squeezed. So a sticking pin likely. Thanks from Holland, The Hague

I had to renew that internal spring, it had rusted and snapped !

I have the same problem, won't turn off, okay straight to the switch and clean the contacts 👍

My sons K4 has the same internal mains switch with the metal cast lever assembly, the spring thats under it has rusted and snapped, karcher do not sell that spring separately, you have to buy the whole assembly including wire and plug for around £50 alll for a biro sized spring but stiffer that costs pobably no more than10 to 20p 👎🤬🤬🤬