I has checked both inlet hoses and water supply, and everything is in order to work properly. Washer: Whirlpool Mod. WTW6120HW0 SER CX3101355

You will need to replace the water inlet valve. Those models are notorius for the valve going bad because it has a built in thermistor/sensor that goes bad in it and when that sensor goes bad it stops the valve from working even if the solenoids on the valve are good. The valve you need is linked below.

https://prismparts.com/products/whirlpool-washer-water-inlet-valve-assembly-pp4459236?_pos=1&_sid=efdd81671&_ss=r