Pump is blocked or valve faulty, or broken pump internally. remove cover check each valve first , if ok remove pump head . turn motor look for piston movement , if no movement, replace or repair pump head.
SOURCE: 2-yr old troy-bilt pressure washer with honda
It sounds like an air lock. Try this: With the machine off, connect the hose to the washer and let it run for several minutes to get all of the air out of the hose, and to purge any air out of the pump. Shut off the water, and connect the high pressure hose, but not the gun. Let the water run for several minutes. stretch out the HP hose and make sure that the air is displaced. Shut off the water, connect the gun, and purge as before. Now crank it washer up. As quickly as safe to do so, open the trigger to keep water moving through the washer. It should come up on pressure very quickly. It is better during normal operation to keep water moving through the system. When I am through for a while, I shut down my washer, but leave the trigger depressed to allow the pump to stay full of water, and cool. This prevents further problems when I restart it.
Hope this was useful.
Regards --W/D--
SOURCE: 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!
SOURCE: We have a Karcher G2500VH pressure washer. If you
Hi, Karcher calls the unloader valve a spill valve,
this is a link to a full drawing/parts listing , and your fault description might well be a sticking /seized unloader(spill ) valve hope this helps
http://www.pressureparts.com/ManualViewPage.aspx?Manual=/mmDEV/PDF/karcherparts/g2500vh.pdf
the part number is on page 9 of the drawing
spill valve 45910400
hope this helps , we usually use some good quality silicone grease to lube the valve ,
SOURCE: pressure washer does not spray consistent flow of pressure
Pressure washers have a pressure regulator/unloader that bypasses the water back into the intake when you let go of the trigger with motor running. If you let the machine run for long preiods in bypass the system could be damaged due to heating of the water being bypassed. The water is in a closed loop. The as the unloader wears it will tend to want to bypass which is what is happening in your case. Dirt trapped at the tip will cause this also. Install clean tip to solve problem. If clean tip did not help then try lowering the pressure by turning pressure regulator counterclock wise. If problem is gone then parts are failing but keep using pump. Good luck.
SOURCE: Campbell Hausfeld PW1380 Pump won't run when water hose is connec
http://www.ppe-pressure-washer-parts.com/campbell-hausfeld-pw138000-pressure-washer-parts
Hope this helps. I have the same problem. It's not the switch but the mechanism that slides inside the switch, which activates the switch to go on and off. I fnally found it so hopefully they have the part in stock. It's not a clogged wand trust me I have torn it completley apart and found out it is the mechanism in the switch is plastic and breaks.
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