Must be a burned contact in the timer
If you follow the heavy red wire from the heater element up to the timer, you will see where it connects to the timer. Usually RH terminal. With the power disconnected and this heavy red lead disconnected from that terminal, connect one lead of an Ohm meter to that terminal. The other lead you can touch to any other terminal. Next turn the timer slowly and see if you can get some continuity between this terminal and any other terminal on the timer. If you cannot get a reading then I would say the timer needs replacing.
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