Have a karcher steam cleaner will not go on but have checked the fuse

SOURCE: Karcher SC 1502 steam cleaner can't get cap off water tank

Dear jrider784,
I solved a problem like this on FIXYA, just a few months ago. I gave this solution. Try to fill the machine from somewhere else. You can do this from the outlet. If you manage to do this, put on the machine. ( now you know that when there is hot water in the machine, the tap goes round free for safety). Now as the water starts to cool down....start trying to see if you can unscrew it. My plan is that with the hot water, the safety will start to work again. If the cap does not release the safety on cooling, then there is no other way but to destroy the cap and replace with a new one. Very important to mention that this job must be done by a qualified technician or some one who knows what he is doing. Working with hot water is very dangerous.
Regards,
Fulltech.

SOURCE: DE4002 Steam Vacuum: Is there a manual for The Karcher DE4002 steam cle...

Hi There,

Here's a link to the owners manual for your Karcher DE4002.

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Owners Manual For Karcher DE4002 Steam Cleaner

SOURCE: I have just used the karcher steam cleaner and now

you need to even the canister pressure. Release the valve from the handheld device, i.e. it needs to be plugged in and pressed. Presure also exists at room temp.