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.
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.
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There are4 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 boardThis 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.
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.
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.
Fairly simple to opperate. Connect water supply hose. Connect wand hose. Plug in, turn on water supply and turn on. Then squeeze the wand handle to spray. With mine, there are times when the unit looses pressure, but if you leave it running, it seems to recover. Also note that you can turn the flare at the end of the wand for a soft stream versus pressure spray. I have had mixed results with the pull out clear tube that is supposed to siphon liquid soap into the mix.
You didn't say if this is a gas or electric machine. I will give suggestions for a gas model. These small engines have air and fuel filters. check both, as it sounds like its getting bad air/fuel mixture. Also try a new spark plug. If this is electric let me know, I'll new some more info.