Hi, welcome to Just answer
How old is it ?
Have you tried to clean the inlet hose and valve ?
not sure where to look
OK, if you have not tried to clean the water inlet hose and valve then please pull the unit out and clean the hose, valve is where the inlet hose will attach to the unit
Is it the Blue pipe or the white one
the fill hose is the one in blue
after cleaning if the problem returns then with the unit unplugged lay it on its side by around 45 degrees so that if there is any water clogged or the float is stuck this will solve the issue
You can get back to me if you need any assistance and I will help with no additional charges.....Is there anything else I can assist you with today ?