When a residential clothes dryer starts up and runs normally for just twenty minutes before shutting itself off prematurely, the malfunction is typically caused by dirty moisture sensor bars tricking the control board into thinking clothes are dry, a severely clogged exhaust vent duct triggering high-temperature safety thermostats, or a failing centrifugal motor switch. You can troubleshoot airflow and sensor issues easily. You can verify that your corrective action is successful when wiping down the metal moisture sensor strips with rubbing alcohol and cleaning accumulated lint out of the exhaust duct allows the dryer to run through a full, uninterrupted cycle.
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