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Change the filter. If you can lower the loader by loosening a line at the valve, suspect the valve. All lines usually dump to tank at the valve. Make sure that line is ok. If any valves are electric, suspect them even more.
disassemble the lock and inside the lock is a small silver reset switch with a reset button with red button just simply press it with fresh batteries and hold it till the lights come on and go out and presto your lock is clear and can be reinitialized...
unplug the washer take off the bottom kick plate of the washer. behind this you will see the pump unscrew the cap and pull it out there is a trap attached to it to catch the debris that falls down. Clamp off the hoses going to and from the pump. If you dont have a way to do this make sure to have rags and buckets around to catch the water. then reach in and pull whatever is in the pump out of the pump if you feel comfortable with skills you can take the pump apart to clean it. Only do this if you are sure you can put it back together.
Assuming that you have a pressure gauge to determine actual system pressure. Without pressure gauge, you could use the sound of the engine as test for capacity pressure (if engine and pump are paired correctly, engine will labor at full throttle under high pressure). Using your machine at rated capacity will decrease the life of the unit. Better to use at 75 ~ 80 percent of cap. (2500psi on your unit). Pressure is developed thru the restriction of the tip/orifice assuming that the pump is working correctly. Tip should be correct for the capacity of the pump. Check the pump capacity for gpm (or test by removing tip connect water supply, then with engine running, catch water in bucket for exactly one min. and measure quantity). Example, 4 gallon per minuite should use a tip with 4gpm markings. If wrong tip size is used, (too large, low pressure, too small, pump will go into unload condition resulting in low pressure) . If thru testing you determin that the correct size tip is installed, suspect valves or unloader. Leaking valves or orings that seal valves will cause low pressure and also cause a pulsating sensation. Worn unloader will cause pressure to rise and fall in a slow cycle. Good luck with your repair