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.
The glass section of the washing machine becomes at least warm if not hot during a hot water wash. You can feel the glass area with your hand when the procedure is going on to see if it is warm. If the glass section remains cold to your touch it definitely indicates a faulty heating element. Another sign of a faulty heating element is the non stopping wash process. Some times the washer refuses to go to the next cycle and continues the wash cycle till you stop it. This happens when the water does not acquire the pre set temperature.