Dryer timer does not advance on automatic (sensor) cycles, but timed cycles work normally.

Safety first: Unplug the dryer before accessing internal wiring.

• Clean moisture sensors: Wipe the sensor bars inside the drum with rubbing alcohol to remove residue.
• Inspect sensor wiring: Access the back of the front bulkhead and ensure sensor wires are intact and connected.
• Test in timed dry: If timed dry advances normally, the issue is isolated to the auto-dry sensor system. Replace the moisture sensor assembly if cleaning does not help.
• Replace control board if needed: If sensors and wiring are good, the auto-dry circuit on the main control may be defective and require replacement.