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Karcher b302 when switched on it makes a low humming noise, not the same as when it worked. There is no pressure at all when the lance is triggered.

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  • 402 Answers

See if you can spin the cooling fan of motor if so you may have a bad capacitor on motor

Posted on Aug 05, 2013

6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: B302 - unable to start detergent flowing - How should it work?

It will only pick up detergent if you use a low pressure detergent nozzle - or no nozzle at all. It also takes a while for the detergent to get to the nozzle.

Posted on Nov 19, 2007

  • 104 Answers

SOURCE: Karcher K 3.68M Electric Pressure Washer. Wand trigger Locks Up.

Sounds like the pressure valve is broken thats why you cant depress the trigger , the valve is on the pump , i would suggest taking it to a repair shop as they are fiddly things to fix

Posted on Jun 05, 2009

  • 2 Answers

SOURCE: When I switch my karcher k4.97 washer on it just

you have an internal crack in the out let head of the machine very comon in thease machine and not expencive to fix

Posted on Jun 18, 2009

seanpwright
  • 2030 Answers

SOURCE: My Karcher 1750 psi electric pressure washer is

thats normal, it is reducing the built up pressure that is not needed until the trigger is pulled.

Posted on Apr 01, 2010

  • 623 Answers

SOURCE: POWER CRAFT BY Karcher bought Aldi on 31Mar 05.2100Watts 130 bar.

You did winterize the machine? Leaving water in a powerwasher will freeze and damage the pump. It's a common happening, because people don't think of it or are not told by the maker.

Posted on Apr 30, 2010

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I switch the pressure washer on motor starts pressure builds up motor stops. OK pull the trigger on the lance the moter starts sounds different water pressure low. Release trigger motor still runs.


It isnt very clear your explanation of the problem but what type washer do you have first? It sounds like you have a bad unloader or need a new variable nozzle tip. Can you explain in more clear detail. Thanks

Feb 16, 2015 | Garden

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Karcher K4


think it must be faulty power

Jun 10, 2008 | Karcher 2500 PSI Pressure Washer

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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?
The humming noise is the motor stalled out against the pump because there is nowhere for the water to go. The shutoff is caused by the safety overload switching off after overheat.
Or, it has a pressure operated run/stop which is not working. Because water and electricity don't mix, I would suggest getting more specific help. You can download Karcher manuals /spares lists online from Karcher specialists but remember electricity is the silent killer.

May 20, 2014 | Karcher Garden

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My washer makes a loud pulsing noise when not being used,as soon as I pull the trigger it works fine.


sounds like your unit has a bypass problem either needs adjustment or replaced

Oct 14, 2012 | Karcher Garden

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Honda 2400 psi before it went out i cold tap the end of the wand on the ground and the pressure would return now when pull the trigger there is no pressure only a fine spray .its a karcher with a honda...


hi,
there is a small ball bearing inside the nozzle on the end of the lance , this can get jammed or missaligned and the nozzle orifice can get blocked , clean this or replace the whole lance with another 200 Bar lance .

hope this helps

Feb 01, 2010 | Honda Karcher G2400HH-R Pressure Washer

1 Answer

Craftsman model 580.752020 electric pressure washer. First time I used it worked for about three minutes then the motor stopped. I cannot get it to start again. Plugged into a 15 amp gfi circuit which did...


turn off water and machine electrics.

remove high pressure hose from front of machine, this may be tight if there is still pressure in the system.
turn on water, when water comes out of machine hose outlet turn on machine. does the machine turn on and water flow increase, if so you probably have a blocked lance jet or trigger.

remove lance extension if fitted and fit hose back to machine, try again. If its ok then this proves you have a blocked lance jet, maybea poke about with some stiff wire will free the obstruction.

If this doesnt bring on the machine you probably have a jammed pressure switch on the pump.

this pressure switch turns on the pump when the trigger is pulled and switches the motor off when the trigger is released.

hope this helps.

Jul 16, 2009 | Electric Garden

2 Answers

Pressure washer


Dear Davidpaulson,
There are many reasons why there is no pressure. The simplest one is try a new lance. The lance you say it is not blocked, but it could have a wider hole with wear and tear.
The second most possible reason is, faulty valves. The suction valves are the most that give low pressure when they are faulty. To check the suction valves, put on the machine in the normal way and as it is working, disconnect the water supply. Than check if air or water is blowing out from the inlet. This is not 100% but you can have a picture of the function of the suction valves.
On the other hand if you do this exercise with the outlet, after removing the gun, you can check for the delivery valves. If you feel suction at the outlet, than the delivery valves can be faulty.
If all is correct, than there must be a fault in the swash plate. This could become loose and so the pistons will stop moving. Also another fault could be broken springs.
Also if the machine is leaking, the high pressure and low pressure seals are damaged. This also lowers pressure.
Other faults are related to the famous spill valve. Also faults could be to internal water leakages, due to corrosion in heads. Finaly I like to add that a faulty electric motor, could also not deliver enough rotation and power, and this also reduces pressure. This could be rewinded or changed for a new one.
Regards,
MG.

Nov 03, 2008 | Briggs & Stratton Prosumer 20324 Gas...

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