When im using the pressure washer it pulses when i depress the trigger. Its not pulsing when the trigger is not depressed.
Ive removed the case and watched it run. There is a pressure switch that cuts the power to the motor when the trigger isnt pressed to stop the pump destroying its self. This mechanical pressure switch is pulsing in and out as is the pressure is getting too high for the machine.
So, im looking for any advise on why this pressure switch should pulse when the trigger is pressed.
If i hold the switch forward with a screwdriver it runs fine!
Can anyone help please!

Tim., September 2010

I had a similar problem with my Karcher. Make sure that your water supply to the washer is not blocked (or your hose is kinked). Having a good and constant water supply fixed mine - it was from my well after all!

Frelon, November 2010

I have a Karcher K2.16b power washer, about 18 months old, it has only been used for about 4 hours in total, when I tried to use it today, it is also pulsing. It was stored in a garden shed over the winter and had been drained prior to storage. It would appear that this seems to be a common fault as the model I had before this one had the same problem.

Davy T, October 2010