Dryer shows F28 and may not respond to controls or start a cycle

Safety First: Disconnect power before accessing internal components.

Steps:

• Clean moisture sensor bars: Inside the drum, locate the two metal sensor bars (usually near the lint screen housing). Clean them with rubbing alcohol and a soft cloth to remove fabric softener residue.
• Inspect sensor wiring: Access the area behind the sensor bars (front bulkhead) and check the small harness connected to the bars. Ensure it is intact and firmly connected.
• Test sensor continuity: With wires disconnected, place a damp cloth across the bars and measure resistance between terminals. You should see a low resistance reading. Infinite resistance indicates an open sensor circuit.
• Check control connections: Verify the moisture sensor harness is properly connected to the main control board.
• Replace sensor or board: If the sensor and wiring are good, F28 may indicate a communication or control board fault, requiring replacement of the main control or UI after proper diagnosis.