Some dryers detect moisture through sensor bars within the dryer ... But if you're not so confident in your ability to correctly follow how-to steps, make a call to your local repair technician.
Think about how the repair cost compares to the original cost. In general, costlier dryers are worth repairing for a longer period of time because the cost of a typical repair is a smaller proportion ...
Stoves, washers, dryers and dishwashers--repairing home appliances ... courses available that can train you to become an appliance repair technician, and some instruction courses take as little ...