Question about Karcher 1750 Psi Elec Pressure Washer

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I was using my Karcher 350M pressure washer working fine but it just stopped having tripped the power boards circuit breaker. The breaker now trips each time I switch on the washer. There is no smell of burnt motor and the electric did not get wet when last in use. Appreciate any suggestions or tests that can be made. I have a decent multimeter. Thanks.

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Posted on Jan 02, 2017

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  • 1 Answer

SOURCE: Electric Pressure Washer

Hi Your problem is your unloader pressure valve switch.It is a cylinder that moves up & down inside a housing,. activaded by water pressure.Inside the cavity of the housing is dirt on the wall of it.Thats your problem.Once you clean the cylinder wall & apply some water grease ,problem gone.Your problem is not the switch.

Posted on Feb 14, 2008

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  • 389 Answers

SOURCE: I was using the pressure washer and it stopped

This problem, where the unit continually switches on and off when the handgun is closed, is quite common. Unfortunately it has at least six different possible causes, only two of which are easily checked. 
The first thing you can do is look for leaks.  Even the slightest leak will cause this pulsing because the unit gets up to pressure, switches off, loses pressure, switches back on again, comes back up to pressure, switches off... and so on.  This repeated switching is not good for the motor and should not be allowed to continue for longer than necessary to observe what's happening.
So... 1. Does the handgun shut off completely, or does it drip? If it drips, it may simply be because a seal has failed. The handgun can be dismantled, checked, and any defective parts replaced; be sure to lubricate O-rings with silicone grease when reassembling. As a last resort, the whole gun may need to be replaced.
2. Are there any visible leaks at the high-pressure hose screw connections?  If so, most likely an O-ring needs replacing - again lubricate the new one well with silicone grease.
3. If there are no visible leaks, either from the gun or from the connections, all other possible causes are internal within the cylinder head or control head of the pump. New parts will be needed and this normally calls for a professional repair, although it's not beyond the scope of a truly competent amateur.
I hope this helps. Any further questions, just ask! Please remember to rate this response.

Posted on Apr 17, 2009

  • 92 Answers

SOURCE: Karcher electric press. wash. Hums when turned on then trips bre

Dear K_mccurdy,
I am assuming that your washer is single phase. A comon reason for humming is a faulty capacitor. This must be changed by a new one.
Now one must see why the capacitor got damaged. This could happen, when the gun is closed the machine starts and goes off again in short intervals. In this case a control valve, often called the Spill Valve, needs lubrication or replacement. I prefer to replace it. Even if the pump has no faults and you have a habbit of closing and opening the gun more than necessary...the capacitor will get damaged. It is also important that if you use soap or chemicals, always rinse with fresh water before storing away the washer. Also never store the washer with pressure still built up. Always release the gun, before storing. Well in your case it must be the capacitor. If the capacitor is OK or you have changed it....try the washer without load. This can be done by removing the gun. You can leave the water supply, for this has a cooling effect during this test. Things should work fine now. If not...then the electric motor must be checked. But I repeat...the most common fault for humming is a faulty capacitor.
Regards,
Fulltech.

Posted on May 07, 2009

  • 384 Answers

SOURCE: re - karcher 330

Overload contition in circuit. Turn some stuff OFF.

Posted on Jul 21, 2009

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1 Answer

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Jeff, the specs say it is 230 volt, 16 amp minimum, start up would be more, probably minimum 20 amp.or larger, check your manual. Are you using a small gage/ low capacity extension cord this could blow a breaker or may have an internal short have checked by a Karcher repair center. Check the attached links,instruction and guides, Good luck
"I hope this helped you out, if so let me know by pressing the helpful button. Check out some of my other posts if you need more tips and info."
Any idea why my new 13 amp pressure washer is tripping 15 amp circuit...
http://www.garagejournal.com/forum/showthread.php?t=203916
http://www.electriciansforums.co.uk/electrical-forum-general-electrical-forum/54098-problem-pressure-washer.html

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Need more info:
What fuse? the one at the end of the cord on the pressure washer? Or the circuit breaker on your house?

If it is the one on the cord it may have gone bad. To test replace it with normal plug (non-GFI) and plug it into an outdoor or bathroom GFCI (GFI) outlet. If it still trips that outlet then there is a ground fault in the device which may be minor or major.

If it is a home circuit breaker remember that electric pressure washers use a lot of power - typically 1500 watts. If anything else is plugged in it can trip the house circuit breaker.

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try to free the motor by turning it somehoe if its free replace running capacitor

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if the breaker in the house does not trip with any other appliance connected to it ie another electric motor say a pool pump or electric motor from a circular saw and does not trip

then it sounds like your blaster has a electric phase to earth short circuit
it will be pulling a very large current

i suggest you take it to your local electrical repair shop to check this out


cheers pauly46

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Check the fuse on the unit. Since this is a electrical unit, it may have also tripped your main breaker on your power source. If using an extension cord, try to use a larger one (size of wire) and shortest as possible. For more info go to www.karcher/co.uk/images/manuals/outdoor/k2 (Troubleshooting problems) .... Good luck.

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Make sure your extension cord can provide 13 amps or greater of current. The longer the extension cord the more current it requires to supply the 13 amps to your power washer. If your unit has a long extension cord it could pull more than the typical 15 amps used for a household circuit breaker. If you do not have an adequate circuit breaker it will continue to trip. Plug the unit directly into the power receptacle or use a larger current rated power cord and power receptacle. If the problem persists then the unit could be pulling too much current due to motor restrictions.

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Re - karcher 330


Overload contition in circuit. Turn some stuff OFF.

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What size generator is required to run 2800 watt induction moter on a pressure washer


Hi,

2800W is 2800W. What will affect your question is wether you run it at 120V or 240V. I would recommend using 240V if you have it. 2800W at 120V will pull just about 24 amps (which is a 30A circuit as circuit breakers trip at 80% of thier rating) but if you use 240V you pull around 12 amps which will cost you half the amount in energy costs.

If you have any questions please let me know.

Lequarius

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