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Message: [QUOTE="Sean Regan, post: 226982, member: 5841"] Decided to jetwash the patio, to remove the few white pigeon poo stains. So I got out my "trusty" Karcher K4 and turned it on. Nothing! I've had it for about at least ten years and only gets used once or twice a year. Checked the fuse, it was OK. Had a think about about it and wondered if the water was getting through. So I turned it off, took off the "business end" of the lance and turned on the water, a few pops and bubbles but then a steady stream of water out of the end of the lance hose. Put it all back together again and success! It was working again. Guess it must have had an air lock in the pump. [/QUOTE]