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Nilfisk Alto Active Waterblaster.Starts up good. When I release trigger on gun it does not start pressure again. I have to take water hose off

When I take off water hose & reconnect it has pressure again.Next time I stop same thing. No pressure untill I take hose off & reconnect.I have cleaned all filters. Can anyone help please.

Posted by Anonymous on

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

david04928
  • 102 Answers

SOURCE: north star petrol pressure washer.

Sounds like the regulator is sticking or is airbound. loosen the water connection and then tighten it back. Could also be that the trigger gun is faulty or needs adjustment. Hope this helped

Posted on Mar 15, 2009

  • 187 Answers

SOURCE: Karcher K 3.68 M operation

These units have pressure valves that automatically turn off the pump once the pressure is high enough. The pressure switches do fail and sometimes stick and act as you've described.

Posted on May 07, 2009

  • 92 Answers

SOURCE: Karcher 3.97M Short cycles after trigger is released.

Dear csdamman,
There is a valve called the spill-valve. It is often called the control valve. This valve activates the micro-switch. When the gun is released, pressure builds up and compresses this spill valve. At the same time it puts off the micro-switch. This will then stop the machine. Now when the spill valve is faulty it cannot hold compreesion under pressure so it starts de-compressing and starts the machine again. This goes on in a cycle as you explained. So you have to change the spill valve. If the spill valve that operates the micro-switch is part of the upper head,...then the whole head must be renewed. Myself I rarely service Spill Valves. The best thing is to renew it. From your explanation it seems that you did not take notice of this Spill-Valve. Infact when you mentioned Pressure Switch, I do not know if you are refering to the spill valve. If you are....then saying that the Pressure Switch moves and operates freely, does not mean that it is OK.
In certain machines in the outlet...there is a small valve, coloured black and red or green and yellow. This sometimes when faulty, it gives the fault you mentioned. Sometimes an inlet valve gives the fault you mentioned. But from my expirience it is most of the time that the Spill-Valve is the fault.
Regards,
Fulltech.

Posted on Jul 22, 2009

SOURCE: Pressure washer intermittent turn on

sounds like a pressure switch is sticking. usually causes this problem especially after being stood for a while not used.

have to remove cover to get to pressure switch, remove pressure switch piston clean regrease with silicon grease refit it m and all should be good.

Posted on Aug 01, 2009

  • 1 Answer

SOURCE: Kew Alto Force X-TRA cold water supply pressure sensor problem

Have the same p-washer (5-6 years old) and the same problem. Opened it and the pressure switch is the crook. A plastic pin has an inner and an outer spring on it (two consentric springs). The smaller inner spring is completely rusted away so the switch no longer operates correctly. Obviously the spring was of a too low quality. The service office say a new switch cost around 400NOK (50 euros) - so the washer is too expensive to mend. But I will try to get it working without the inner spring. Doubt if I succed. So will have to dump the washer.

Posted on Apr 28, 2010

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Hi I have a nilfisk alto that has not been working properly. It has not been spraying the water


Alto nilfisk vaccuum is not spraying water , a highpressure washer do you mean not a vaccuum .

But If it's an alto nilfisk blue pressure washer on the vaccuums topic it must be the bypass / autostop on the pumphouse its internally a point where a microswitch is placed and depends on the type of washer by a problem with the parbak ( a parbak is a oring/ with auxiliary kevlar ring(s)) that can hang on lime, but on an other model there are 2 springs on the bypass and one of them the great spring is broken or only hanging on lime but thats rare if it is.
I don't know if there are vaccuums with water spraying only for remove dust.

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Fault Nilfisk Alto pressure washer


see the diagram and repair swtich:



5_14_2012_3_49_45_pm.jpg5_14_2012_3_50_08_pm.jpg

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1 Answer

I have a honda 2600 pressure washer. After running fine for a couple of seconds the water will stop flowing out the tip. It is receiving water,but will not flow it to the pressure hose. I even disconnected...


This happens when air gets inside the hose. An air bubble of sorts is in the hose and will not build pressure until you blow the air out of the line. Start the pressure washer, turn on the water. pull the trigger on the gun. It will spitter and spatter and come to a trickle. release the trigger on the wand. Pull the trigger again and it will eventually work it self out.

Jun 13, 2011 | Honda Black Max 2600 PSI Pressure Washer

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I bought a honda pressure washer power boss 3000. I load the gasoline, start the machine, but pressure water is not coming out from the trigger. i tried so many things , but can t get started.


If you are using a water tank for water supply, remove the water supply line from the pressure washer and connect a water hose from a faucet. Turn the water on, then crank the engine. Pull the trigger of the spray gun until water comes out. When then water starts to spray properly the release the trigger, shut engine down with pressure on the line then reconnect the water supply from the tank to the pressure washer. If this fixes the problem then the problem was "air-locked"! Happens alot with new pressure washers that have never been run. If you need any other help, please email me @ davidandlisacampbell@yahoo.com

Feb 18, 2011 | Honda Pressure Washer PSI 3000

2 Answers

Cant start the unit ,there is to much pressure on the pull chord when water is hooked up.


Trying to start a pressure washer with water supply on and gun trigger off will be a difficult task. It could be comparred to trying to start a lawn mower with the mower in tall grass. Place the mower on the drive or walkway and pulling the rope to start the engine is much easier. It is easy to start your pressure washer with no water in the system however there is a remote possibility that you could overheat the seals if you take too long to turn on the water. It is a little more difficult to start the washer with water supply on and someone holding the trigger to wand open. This will prevents pressure from building and making engine hard to start. You will not damage your washer if you start it with water supply off if you flood the pump and pressure hose with water first . Here is the procedure I use if i am working alone. I trun on the water to pump and open trigger to gun to allow water to flow into pump and pressure hose. Turn off water (leaving the water supply on will make it a little harder to pull starter). Start engine while holding trigger to gun open. When engine starts release gun causing unloader to activate circulating water in pump. Now turn on water and you are ready to work. If your system is under warranty however, I would advise to use the starting procedure outlined by mfg (hold open trigger to gun however). To get the longest life from unit try using it at say 75% of capacity or lower if your can and use max pressure on the tuffest jobs. Leaving your washer at full pressure for all jobs is like driving your car at 100 mph everywhere your go. Good luck.

Aug 24, 2010 | Northstar Professional Series Pressure...

3 Answers

Kew Alto Force X-TRA cold water supply pressure sensor problem


Have the same p-washer (5-6 years old) and the same problem. Opened it and the pressure switch is the crook. A plastic pin has an inner and an outer spring on it (two consentric springs). The smaller inner spring is completely rusted away so the switch no longer operates correctly. Obviously the spring was of a too low quality. The service office say a new switch cost around 400NOK (50 euros) - so the washer is too expensive to mend. But I will try to get it working without the inner spring. Doubt if I succed. So will have to dump the washer.

Mar 19, 2010 | Garden

1 Answer

Ex-Cell VR2500 Builds Pressure but Won't Spray


I have a similar problem and diagnosed it to be a problem with the gun. I spoke to a technician that services this pressure washer and he walked me through all the diagnostic steps. The pump is working because there is pressure being built up and the gun sort of works because you can get water out before the washer is started. The technician said that the mechanism inside the gun is either clogged or broken. I am going to Home Depot or Lowes to purchase a new gun and will try it tonight. Guns are only about $30-40. He said generic is fine as long as the thread matches and PSI is in range. Good luck!

Aug 09, 2009 | Karcher 2500 PSI Pressure Washer

1 Answer

No pressure


It is probably air locked....Here's what you need to do. Connect the garden hose, and HP hose, but not the gun. Turn on the water, and let it run while you make sure that there are no high points in the garden hose that can trap air....Work the hose so that any air is displaced through the pressure washer. Continue in this manner through the HP hose. Shut off the water and connect the gun. Turn the hose back on, and operate the gun for several minutes, pulling the trigger and releasing. This alternately allows the water pressure to build up on house pressure and then to depressure, pulling residual air from the system. Release the trigger, and start the machine. Usually, this is enough to get full washing pressure. If it is very difficult to start, you can hold the trigger down on the gun and pull the start cord at the same time. Holding the trigger down acts as an unloader, making the starting easier.
Hope that this helps, --W/D-- please feel free to rate this solution! Thanx!

Jul 31, 2009 | Garden

1 Answer

I have a alto pressure washer i have problem with the trigger


GO TOO WAL MART AND SEE IF THEY HAVE A COMPARABLE TRIGGER AND NOZZLE ASSY. REPLACE THE THING WITH SOMETHING DIFFERENT. WHAT YOU HAVE IS JUNK AND WON'T NEVER WORK FOR LONG.

Apr 21, 2009 | Karcher 2500 PSI Pressure Washer

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