If it works the receptacle is good. Make sure the water faucets are turned on. If the faucets are off, no water will enter the machine when the machine is turned on. Machine leaks in spin cycle Check the drain port behind the machine. If water is backed up here, you may need a plumber.
Machine knocks when washing Make sure the load is balanced.
Be sure the water level you select matches the load you place in the machine. A low water level with a full load can cause excessive strain on the transmission and cause it to knock. If you have a rubber drain hose, make sure there are no kinks or clogs in the hose. Some machines are designed where oil from the transmission can leak from the upper seal and cause oil spots on the clothes, this will require a service technician.