Karcher 620m runs for e.g. A split second, sometimes 1 second, then trips a separate RCD. Is this a wiring fault in the motor? The on/off switch internals look ok. I have had it running for several seconds, but when out back together this fault returns.
Find someone who understands electricity and check each part fo rearth leakage. Whe n you fin dthe part consider replacing the part of if it would be cheaper to replace the Karcher.
XXXXX
November 2015
Automatic Answer
While you wait for answers, we may have found some information which could help you.
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix general d.i.y.