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This happened to my FC5 too. I found that the detergent outlet within the suction head was clogged up. This is the receptacle for the brass nozzle you can see when detaching the suction head (by pressing the grey button and gently pulling on the yellow "cover" at the top of the cleaning head - Figures 16.1 and 16.2 in the manual). To check it is indeed clogged, put a few drops of water in it - they won't drain out. To purge it I used the jet from a handheld steam cleaner, and I also used the steam jet to clean the suction slots. Be very careful not to scald yourself, wear gloves, and when cleaning just pulse the jet so as not to risk damaging the plastic parts.

Karcher Garden | Answered on Dec 29, 2018

K?rcher UK Good afternoon

The WV does not have a serial number - Please input "000000" Into the "Serial Number" box. Please note - the registration is not validation of your warranty. Your proof of purchase (receipt) will need to be provided, should you have and problems with your machine.

We hope this helps, If we can be of any further help, please do not hesitate to contact us.

Kind regards,
The K?rcher Facebook Team


Where the serial number on the karcher WV window vacuum

Karcher Garden | Answered on Nov 18, 2018

Possibly. The amount of "badge engineering" going on, its possible they are the same machine with a different name sticker. You would need to have both to confirm.

Karcher Garden | Answered on Oct 30, 2018

you need to use i believe the black tip where there in least pressure it does not work with pressure

Karcher 2500 PSI... | Answered on Sep 28, 2018

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