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Do you have a model number so I can better assist you? It should be located on a sticker just inside the door way. Also, what happens if you set the dryer on medium cycle exactly? Will the dryer not run at all? Does it run but doesn't heat? etc...
I am a different tech do you still need help?
So if you put it on timed dry you can not set it past 48?
Are you sure the vent is clean all the way to the outside?
Is the blower duct clear and have you take the thermister out and checked it and cleaned it?
I would say there must be something wrong with the control as that would be the only thing that could have changed the time. You may need a new control board to fix the whole issue I can think of nothing else that would cause that.
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