I have a pressure washer that runs but no pressure, I was using it at the time and all of a sudden no more pressure.

Hi try cleaning the lance with descaler, these washers have a habit of lance getting blocked by limescale. Good luck

Does the electric motor keep running? If it does continue to run with the trigger in the spraying position, then your pressure switch and motor are OK. If the motor is running and the water is not coming out with pressure, then either your check valves are not closing properly or the pumping mechanism is in need of repair. I think those little electrics have a simple wobble plate design. Basically not worth the effort to fix them

sounds like a faulty unloader valve i would not recommend using it unless problem make sure unloader is not overtightened

There can be many reasons why your pressure washer stopped working. Do you have a gas power washer or an electric one?

I fixed mine works good too, watch my video step by step i put it on youtube
http://www.youtube.com/watch?v=UFXSLOBL0Mg

3 Beeps/E30--Error: Drum overfilled. Cause: Inlet valve,pressure switch or control board failure.Select drain/spin to remove water. Restart.

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If you remove the tip, will it work? If so, unloader valve is sticking and needs to be removed and lubed with lithium grease.

Pull starter rope wheel is Jamming against casing usually some lube n check for ware will fix it

Leaving the engine running for more than two minutes without releasing pressure trigger causes aluminum pump to overheat and causing damage to the purmp, resulting in sudden low pressure. (see page 9 in manual)

the pump went bad