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I own a GBG power 2000 pressure washer and I cannot get it to run. It will hum for 3 seconds and then trip the reset.

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Release the trigger pressure to allow for start up. Sounds like motor jambed by pressure build up. After motor is running it should be okay.

Posted on Oct 06, 2010

  • Van Blades
    Van Blades May 28, 2014

    mine will run for about 10 min. and then trips the reset switch and then I wait about 8 min and can push the reset switch and it will work again for about 10 min. continues this act as long as I am patient.


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What is this problem - Karcher 3.86 electric pressure washer: humming noise, plug gets very hot, then unit shuts down?

Your pressure washer is either not fitted with a run/stop device in which case like mine you have to switch off within a few seconds of closing the trigger. Check your model features?
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I have an ingersoll-rand ss5 that intermittenly hums and trips the breaker at start up. I replaced the check valve could a pressure switch cause this to happen?

Hope I can help you. When you say intermittently hums and trips from start-up. Is this when the receiver tank is empty, or up to pressure?
One of the first thing to try, you seem to have done, it is usually the check valve which can cause this.
The second thing to check would be the capacitor, but you say you have replaced the motor, was the motor AND the capacitor replaced at the same time?
By what you describe it does sound like a power problem, the pressure switch shouldn't be the cause of the humming. (The pressure switch simply tells it to switch on when the pressure is low, and to shut off when it is up to pressure)

Do you have any other power tools or equipment plugged into the same system? It may be that you might not have enough power to run all your machines?

Finally, do you have your compressor plugged into an extension lead? Vital power can be lost doing this, if so, and if you can, plug it straight into the power socket and try that.

Kind Regards


Oct 04, 2012 | Ingersoll Air Tools & Compressors

1 Answer

I own a GBG 2000 pressure washer and I cannot get it to run. It just hums and then after 3 seconds, kicks off the reset button. What do I need to do?

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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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.

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