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Why does my Karcher K2.94 pressure washer only starts when cold?

It starts every time cold.But after running it will not.If I leave it for an hour or so,it will run again & keep going till I stop,then it needs its hours "rest".There is no mention in the instructions about a thermal switch,but I suspect it has (a faulty) one.
Ron, February 2011
It sounds like there are pressure built up in the system. try squeezing the trigger while you try to start the engine.

nobody, May 2011
link Click here to see other fixes for Karcher.