Need help with GE triton

That knocking noise is probably coming from your water line, and that happens when there is some kind of a ripple/wave effect when the water goes into your dishwasher (DW) thru the inlet/fill water valve. First turn your hot water valve off, underneath the sink coming from the wall and it usually is also going to your kitchen faucet. Then turn the electricity off by locating the breaker to the DW line and turning it off, or if it is plugged in an outlet under your sink, just unplug it. Then take the kick toe panel (panel with 2 or 4, 1/4" or philips screws) from the bottom of the dishwasher. You will then see the water hose, or could be a copper pipe, going into the valve (will have a selenoide, cylinder shape on top and have 2 wires plugged in to it). Unscrew the hose/pipe from the water valve and get a small wide bucket or pot and aim the hose/pipe to it. Slowly have someone open the water valve from under the sink while you hold it in the bucket/pot. If you hear the knocking again, you will need a plumber to check the pipes, hoses and water valve at your wall. If you don't here the knocking noise, just replace the dishwasher inlet/fill water valve part # 785330. http://www.repairclinic.com/0080.asp. Please post back.