Hi, Karcher k3.79 electric washer. Its a standup model with 2 plastic wheels. anyway it won;t shut off when you let the trigger go. it will however, pulsate on and off until it appears to shut itself off. then when you restart it works again but only temporarily - pulsates and shuts off again. bascially you have to keep the trigger pulled all the time to keep it on. any help appreciated.

Garden - Karcher