The above mentioned signs may or may not indicate a faulty heating element. The reasons for the above noted symptoms might be some thing else. The sure way to confirm a faulty heater is using the ohmmeter. It is a device for checking electrical values like resistance between 2 conductive appliances. To test if an element is working or not a professional connects neutral wires to the related connectors on the element and verify it for a positive reading.
Providing water level indication eg, by using a dishwasher pressure switch to activate LEDs or lights to indicate the water level in a tank. By using two dishwasher switches and adjusting their individual set-points, it's easy to have six levels indicated. However, you'll need a lot of wires to connect the switches to your display.