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karcher works, but pulsates on and off constantly ?

When using my Karcher, it seems to pulsate, almost as if it's switching itself on and off every few seconds, makes any job, really frustrating. Any ideas?
Mark, November 2010
I had the same fault on my last karcher.I cleaned the nylon filter on the intake(hose end),& also cleaned the nozzle on the lance.It worked great.Good luck.

Ron, February 2011
link Click here to see other fixes for Karcher.