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DISCONNECT HYDRO OR WITH ENGINE NOT RUNNING DISCONNECT SPARK PLUG THEN RE-LEAVE WATER PRESSURE BEFORE SERVICING the detergent pipe plugs into a pipe on the pump, under which is a spring and ball bearing (stuck open, debris) WEAR YOUR SAFETY GLASSES
This fault is within the control head, under the detergent valve is a small spring loaded valve that acts to induce the detergent, this will have failed, the shaft of the component breaks off the disk base leaving a small hole in the centre of the disk. This is enough to allow pressure past the component. The machine will pulse when operated and will not induce the detergent. I've looked everywhere to find this part as I have a karcher with the same fault.
On pressure washers with cleaning solution pick-up hoses you have to make sure you are using the black, low pressure, soap tip. If you are using the high pressure tips, red, yellow, white or green, there will be too much back pressure at the pick-up tube for it to work properly. If you are using the soap tip, check that the pick-up tube and filter are clean.
Hello Sue, you don't say where in the world you live, but if you are attempting to clean dirt and algae off pavers, you need to add a solution to the water jet via the inbuilt attachment. Mix a fairly mild solution of bleach and detergent, pus a dash or deodoriser to the cantainer. Put your karcher on low pressure and give all the blocks a good wetting. Do this in the morning so the solution doesn't dry. After 20 ~30 mins, Claen off with the Karcher on normal high pressure (not the tubo lance). HINT: Leave the trigger on all the time and don't stop and start using it. This will prevent hayraulic hammer which can split the pump head.
The first thing to do is check the nozzle setting on your spray lance. The nozzle setting is adjustable (by twisting it) and, if it's set to high pressure, cleaning fluid will not be drawn up from the reservoir. Cleaning fluid will only be drawn from the reservoir when the nozzle is set at low pressure. (Even at the low pressure setting, this problem can occur if you use an extension high-pressure hose.)
You say the machine has never been used, so the nozzle setting is the most likely cause of your problem. Other possible causes are highly unlikely to occur in a new machine. If adjusting the nozzle doesn't help, I suggest you contact the dealer from whom you bought the machine.
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