Small Engine Troubleshooting Problems? Ask a Mechanic Now.
#38 is the pressure switch that has to turn the pump on and off when you release the trigger. Problem is, the switch is almost the price of the unit! It is a switch that can't be serviced, only replaced!
It may be different, but your cleaner has same type pressure switch. Locate it and see if it can be removed and cleaned..Some pressure washers have a valve that moves up to trigger the switch.