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I have a K399 when I switch it on it surges until I press the trigger on the gun.
Answer this Question (2 Answers)
- you may have a leaking O ring
- Hi Crippen sounds like you have a fracture in the control head as I did, this opens when the machine builds up presure and then releases it through the fracture, it is likely the fracture is under the metal head plate used to secure the unit head hence you cant see it, I know your post is long ago but this may help others as when I read the posts on the espares site it was no end of help to me. If the seals are ok on everything else I suggest replacing the control head housing.
Karcher Pressure Washer O Ring Kit Stock Number: ES537803
Keep your pressure washer hose and hand gun leak-free with these replacement seals
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