Check your lance nozzle is not blocked... Remove the lance from the trigger assy and see if you have water coming through then. If you do then the nozzle is blocked :@)
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Check the fuse on the unit. Since this is a electrical unit, it may have also tripped your main breaker on your power source. If using an extension cord, try to use a larger one (size of wire) and shortest as possible. For more info go to www.karcher/co.uk/images/manuals/outdoor/k2 (Troubleshooting problems) .... Good luck.
None of these fixes works for me and the original poster, like me what he's saying is when he swaps the high pressure lance for the patio attachment it pulses on and off, but when that happens, you can swap back to high pressure lance and it's fine. This means it's the patio attachment not any valves or power source, I have the same problem
Try turning the water almost off at the faucet and then loosening the water feed hose connection where it attaches to the washer. Sometimes the pressure in the pump is so high that it will effectively lock the engine and you need to relieve the pressure to be able to restart it. Once it does restart, get the water flow back ASAP as the water is used for cooling and it needs to be there quickly.
bob I had this happen to my Karcher, the pressure seals have blown. $Au200 for service and replacement from karcher dealer. tyhey would not sell the parts for a DFY
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