Inadequate pressure from my Alto pressure washer

The technical details of this fault code are shown in the first image below. This information is valid for most Kenmore HE2+ washers. It is likely that it will apply to your model. If the washer is not filling with any water, check the water supply faucets behind the washer to make sure that they are properly open. If you are using a floodsafe device as shown in the second image on your water supply lines, I recommend replacing this device with normal water supply hoses. The floodsafe device will not work properly on most washers. Turn off the water supply faucets and remove the supply hoses from the connection on the back of the washer. Check the inlet screens on the back of the washer for debris or deposits that could prevent the washer from filling properly. Clean the screens if necessary and carefully replace them after flushing the inlet to the water valves thoroughly with water. (Failure to properly flush the inlet area could result in debris getting past the screens and fouling the inlet water valves.) While the water supply hoses are still disconnected from the back of the washer, place the ends of the hoses in a bucket and briefly turn on the water supply faucets to check the water pressure and flow from them. If the water supply is inadequate, you may need a plumber to resolve this problem. If the washer still won't fill after checking these issues, then you could have a failure in the solenoid water fill valves for the washer. You could also have a wiring failure or a problem with the electronic control board.

If the washer is filling, your problem would likely be in the water level pressure switch or the air pressure tube between the bottom of the tub and the pressure switch. A wiring failure or control board problem could also prevent the water level from being properly detected. To access the water level pressure switch, you can unplug the washer and remove the top panel. Screws at the very back of the top panel secure it to the washer. Remove these screws and then pull the top panel slightly back and then up and off the top of the washer. The water level pressure switch is normally on the rear of the right side panel of the washer. Check the air pressure hose and wiring connections. If no problems are found, you may need to replace this part.