It sounds as if the thermostat has gone bad. It is a small round item that is located in the vicinity of the heating coils if it goes bad it will stay in the open position not allowing the heating coils to get hot. The best way to replace it would be to buy a complete heating coil thermostat unit at the same time and change it all out at once. When you handle the coils in the process of taking them out, changing just the thermostat then putting them back in can cause the coils to break. The repeated heating and cooling of the coils makes them brittle. To reduce the trouble of tearing it down replacing thermostat putting it back together and finding out you messed up the coil. Just do them both at once.
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