Question about Karcher PSI Electric Pressure Washer

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Motor start and stops continuously. Karcher k3.97

Motor start and stops continuously. Looks like a leak in the pressure valve device

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6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

SOURCE: karcher 520m spill valve jammed

Clean the spill valve!

Posted on Aug 20, 2008

  • 10865 Answers

SOURCE: Karcher Pressure washer surging/pulsing

here is a troubleshooting link for Karcher products

http://www.the-power-washer-advisor.com/electric-pressure-washer-troubleshooting.html

Posted on May 31, 2009

  • 2 Answers

SOURCE: Karcher K 2400 HH Pressure Washer no pressure

http://www.landanorthwest.com/documents/instructional/spill_valve_instructions.pdf

Posted on Jun 05, 2009

  • 174 Answers

SOURCE: No pressure / Karcher G 2400 HH

Hi ruthkapres:
Here is a diagram. The unloader/spill valve is #12 on page D2 or F2 depending on your model. You must pull it out, inspect the o-rings for dents or tears and make sure the valve is lubricated with a good water proof lubricant.

Posted on Jul 15, 2009

  • 1 Answer

SOURCE: Karcher pistol gun has broken

Make sure you DO NOT have a check valve (this is what stops your hose running when you disconnect from the hozelock fitting) in your hose pipe system, This will send a shockwave through the pressure washer and destroy the fitting you mentioned. They can be easily removed.

Posted on Jul 25, 2009

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1 Answer

Model hpw2201. How do I fix an oil leak?


Don't know this model intimately but it looks similar to the Karcher which is really total **** nowadays as its all made of plastic. The motor has a weird switch mechanism but if it tries to run and the motor doesn't then 100:1 the motor is seized. Very unlikely it's the actual motor but the pump is a "swash" plate that opens 3 stainless steel thin flat valves. the bearing that the pump shaft goes through is a phospher-bronze plain bush with a seal each side and if this has dried out then you are screwed. Same if you model has steel roller bearings. However, if it does run and build up pressure and it stops because the output pressure is too high then the overload pressure switch is faulty. If it is the Karcher type then again you are stuffed but if it is similar to the Nilfisk then a replacement is available for around £100 GB Pounds - probably cheaper to buy a new one.

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If its not the fuse in the plug it might be the on/off switch. I would check switch for continuity with a multimeter to rule it out first.

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1 Answer

Why does my karcher powerwasher starts and dies after 2 minutes


dirty carb , clean carb, install a fuel cut off valve ( or start using it if you already have one) when you are done washing, turn off the fuel valve and continue spraying water until the engine stops. That will empty the carburetor bowl and the carb will stay clean until you want to use it again.

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1 Answer

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try the machine with the lance removed from the gun.

buzzing is usually the noise made by the motor when it cant turn. if the pump start to pruduce pressure but the pressure builds up too high then the motor will stop turning... faulty lance or faulty spill valve (dump valve)

If you have a Karcher then you should always post your machines barcode.
The karcher barcode is on a silver sticker and is usually 15 digits long. Example 156987400000123 is actually model 1.569-874.0 and serial number 00123....

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1 Answer

I have a Karcher K3.540 pressure washer. Won't take up detergent and motor pulses ever second if vari-lance increased towards maximim. Motor runs ok at lower pressure but can take 1min to start wh


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.

Jan 22, 2012 | Karcher Garden

1 Answer

Hello there.My Karcher pressure washer motor constantly runs with no pressure coming out of trigger gun.I have tried another gun with the same result.The motor should stop/start when you press gun.The...


The valve that admits more water to be compressed is stuck. It is likely the O-Rings on it need replacing. No water to the pump, no pressure!

The motor will stop when pressure is up to the designed pressure.

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2 Answers

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1 Answer

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Diagram here
It could be the Overpressure valve is leaking #20
It could be one of the small valves is not sealing #14 and #15
The soap valve could be not sealing #7
I have also seen micro cracks in the cylinder head #8
Good Luck

Jul 19, 2009 | Karcher K2.26 Electric Power Washer

1 Answer

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if there is no water leak, then yiou may have a crack in the machines outlet head, the crack is inbetween the bypass chamber and the machines safty valve

Jun 17, 2009 | Alfred Karcher K 5.93 M Electric Pressure...

2 Answers

Karcher KB 499


Hi the pump surges when there is a leak on it find the leak that should sort your prob.
Hope this helps. Sean

Feb 17, 2008 | Karcher 2500 PSI Pressure Washer

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