If your dryer timer does not shut off on timed or automatic cycles I would suspect the timer to be at fault.
It would be best to check the timer motor for voltage if you have a volt meter and know how to use it, but chances are it's just a bad timer and will need to be replaced.
You have your model number listed as LER5848E05 but I believe it should be LER5848EQ
I looked up the timer part number for model, LER5848EQ
5 and found that it uses timer part number: 3976573
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