There are no error codes showing, water is definately getting hot but dishes on bottom tray not cleaning, i have used few products specially designed to clean the dishwasher itself without any dishes in, checked the filter, salt, etc, used tablets, gels ... nothing seems to work. Dishes just not clean !

Lower washer not working but upper washer is. This is due to the dishwasher thinking it is on half load. the sensor is faulty and you need to replace the whole unit (water circulation pump). However if like me and your not bothered about having a half load and always use both trays on your dishwasher you can fix it. remove the dishwasher unscrew the side panels and remove, unscrew the bottom panel. Tilt it on its back and then unscrew the feet and remove the bottom panel. There you will see the water circulation pump. On the top is a sensor with 2 white and 1 orange wires going to it, unscrew the sensor and underneath remove the white plastic valve/flap and its supports. with the valve/flap removed replace the sensor and build it back up. Now the water will flow through both cambers (upper and lower).

Check that the arms spin freely when spun by hand, then check the outlet jets at the trailing end of the arms are not blocked with food particles and other solid matter. This often happens and the arm is unable to turn because the water jet that is supposed to drive the arm does not have the force to rotate it with the result is that the upper dishes do not get enough water and chemicals. .