Ok hear we go ,have had the karcher just long enough for the warranty to run out ,it draws its water from a tank in my van no probs for 12 months or so till it started getting a little reluctant to start,remedy connect it to mains water supply and it would spring to life,till just after christmas,then nothing rang spairsgiant they sent out a new on off switch now fitted and back to square one .the engine sounds to be working fine have disconnected the hp hose and ran mains water through for 20 mins, reassembled switched on and nothing just the usual normal engine noise and mains pressure water at the lance,inlet filter is clear ,and there are no leaks noticed ,i run a heater in the van on cold nights so i dont think frost is an issue ,any ideas please???????
Your problem is simply a worn bypass valve on its awy out. It still works enough for mains pressure but can not pressurise when drawing water.
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