If your dishwasher runs, but the water does not make it inside, there could be a few potential issues with the water inlet valve or the related components. The "round blue device" you mentioned is likely the water inlet valve, which is responsible for allowing water to enter the dishwasher during the wash cycle.
Here are some steps you can take to troubleshoot and potentially resolve the problem:
Check the water supply: Make sure the water supply to the dishwasher is turned on and that there are no kinks or obstructions in the water supply line.
Inspect the water inlet valve: Locate the water inlet valve, which is usually located at the bottom of the dishwasher behind the kickplate. It will have two electrical connectors and water supply hoses connected to it. Check for any visible signs of damage or leaks.
Check the wires and connections: Since you mentioned two brown wires that connect to the water inlet valve, inspect these wires and their connections to ensure they are securely attached and not damaged.
Test the water inlet valve: Use a multimeter to test the continuity of the water inlet valve. With the dishwasher unplugged, disconnect the electrical connectors from the valve and measure the resistance across the valve's terminals. If there is no continuity (infinite resistance), the water inlet valve may be faulty and needs to be replaced.
Clean the water inlet valve: Sometimes, debris or sediment can accumulate inside the valve, causing it to get stuck or not function properly. If the valve looks okay but isn't letting water through, try cleaning it to see if that resolves the issue.
Seek professional help: If you are unsure about how to perform these steps or if the issue persists after troubleshooting, it's best to contact a qualified appliance repair technician. They can diagnose the problem accurately and safely make any necessary repairs or replacements.
Remember, safety first: Always unplug the dishwasher from the power source before attempting any troubleshooting or repair work to avoid the risk of electric shock or injury. If you're not confident in handling the repair, it's safer to seek professional assistance.