My nearly-new Kaercher pressure washer has developed a problem... when I use it with the 'normal' wand (as opposed to the twirly dirt-blaster thingy), the motor/pump keeps cutting in and out so that I get a pulsatile flow of about two blasts per second. (I have occasionally seen this with the twirly wand as well).
What could be causing this? I wondered about a partial blockage in the wand - would that cause these symptoms? It seems to work perfectly well when the pump is in its 'on' phase, and I can't see anything amiss. The water supply by hose is fine I'm sure - it's fed from a direct mains-fed tap.
Any advice ? Thanks David