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Karcher Pressure washer

I have karcher 620m pressure washer. Motor runs and water comes at normal pressure to start with but then few seconds later it makes funny noise and it shutsdown, then if I press the on/off button again it starts , but the same thing happens, Please help.

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  • Anonymous Mar 12, 2014

    karcher 620M won't engage

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Hi
don't know if this will help, but when I use mine, to start the pressure up I have to turn the nozzle to fine spray then turn it to the power spray and it works every time, shouldn't have to do this but I got it for nothing.

Posted on Jun 05, 2008

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My Karcher pressure washer Leaks and has no pressure


LOOKS LIKE THE QUICK CONNECTOR IS BAD. IF ITS LIKE THE WASHER I HAVE YOU CAN REMOVE THE QUICK CONNECT AND HOOK UP HOSE DIRECTLY.

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At start of cycle, washer drum turns one direction for a few seconds,then spins in other direction for a few seconds and then stops. Next I hear a short buzzer coming from the door area repeat a few times....


There are 4 common trouble makers to consider.
One is the door switch, it can open circuit and stop the washer.
Second is water pressure. If the water pressure is low/poor, the washer will start to fill and then shut off. Check and clean the fill valve entrance screens and also check for any washer screens on either end of the fill hoses.
The third is possibly the most common trouble maker for this type of a complaint. The fuse blows on the motor control board This board can be found on the front bottom on the right side. The motor control board must be replaced when the fuse has blown. Most times now the motor control board is .
The fourth is a bad start switch, sometimes the contacts in the start switch will arc and burn causing starting up problems.

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Check to see if there's good water volume coming through the hoses attached to the washing machine. If there is, check to see if the screens inside the water-inlet valve are clean. (The water-inlet valve is the device on the washing machine that the fill hoses are attached to.) If they're clean, you probably have a defective water-inlet valve. If so, you should completely replace the valve.

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I have a Karcher K3.97 pressure washer. I think I'm losing pressure somewhere because the motor surges on and off every few seconds. No obvious leaks though. Could there be an internal leak through a...


Dear Sir(s),
The majority of power washers have a spill valve or sometimes called a Control Valve. This spill valve will contract when the gun is closed. As it contracts it switches off a micro switch. Also at the base of the spill valve, an opening opens to let water circulate. Now if this Spill Valve is defective, it will make the machine lose pressure and it will make the machine switch on and off also. I sometimes service the Spill valve and lubricate with special Silicon grease. But if the end of the Spill Valve is not closing correctly, then I suggest that the Spill Valve be renewed. To come to see the Spill Valve, you have to open the cover. Most probably you see wires or a thick wire attached to the head. The part attached to the head contains the micro-switch. Remove the Miro-Switch holder and then you might see screws holding the jammed or faulty spill valve. If you cannot pull the spill valve out, try attaching water and sometimes you can switch on the machine for a second...and with the pressure,...the spill valve will be spitted out.
The switching of ON and OFF due to a faulty Spill Valve, will for sure damage the capacitor. A damaged spill valve gives all these symptoms. Machine going on and off while gun closed and while gun opened, and added to these,... pressure gets less. One small other hint....if all is OK with the machine, and when spraying the machine goes on and off....this is due to a blocked nozzel.
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