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Karcher 550c keeps tripping electric and making a bang

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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

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  • 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

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  • 68 Answers

SOURCE: I have a karcher power washer electric.

This could well be just needing a new motor capacitor as this helps the motor to start.

Posted on Jun 24, 2010

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HOWEVER, this is highly unusual. If the machine is tripping the power then you should take great care. either you have an electrical fault (The motor may be failing and burning out, or another component may be failing unsafe) or you may have a water leak from a defective hose somewhere that is getting electrical equipment wet. Just remember that water and electricity are a very un-funny mix and your trips are there for a good reason.

Does the machine trip the power as soon as it is powered on, even after standing for days (Probably an electrical fault)? Does it trip as a particular thing happens, such as moments after the water coming into the machine or as the drum starts to agitate or the spin cycle starts or as the water empties.

Here are a few suggestions. Having thought about when the fault trips the power, do the following:

TURN OFF THE POWER AND UNPLUG THE MACHINE FROM THE WALL. Isolate the water supply. Make sure that the machine is drained of water. Now it's safe, look for water leaks.

Take the top off the machine (Usually a couple of screws in the back and then the lid will tap forward or pull back depending on the model). Look for signs of water inside the chassis, where the water pipes run from the inlet valve to the soap tray. The rubber gasket around the door may also be cracked and leaking. A classic point for the start of a leak is the rear bearing of the drum (This is the centre of the big wheel of the drum), you may see water marks or limescale buildup that has dripped from the bearing if it is leaking.

If you are looking underneath for leaks, never tip the machine all the way onto its back, you may cause a water leak inside the machine. ALWAYS tip BACKWARDS, so the control panel for the machine is pointing up to avoid water getting to the control panel. I would recommend putting a chair behind the machine as you tip it, so the top back of the machine comes to rest on the seat and the machine is at about 45 degrees. this will give you access to underneath without a leak and make is a lot easier to tip it back on to its feet again afterwards.

While the machine is on its back, look at the motor, If you can, have a good sniff at it (Do you smell burned electrical equipment?) Look around for other components such as printed circuit boards, visually inspect and sniff them too.

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