Problems you may notice
• Dryer stops mid-cycle unexpectedly
• Clothes remain damp after a complete drying cycle
• Dryer runs longer than normal without shutting off automatically
• Error code Err4 or E4 displays on the control panel
• Dryer may not start at all when the error is present
• Excessive heat during operation as the dryer cannot regulate temperature properly
• Inconsistent drying results across different load sizes
Possible Causes
• Moisture sensor contacts are dirty, corroded, or obstructed with lint buildup
• Faulty or damaged moisture sensor element
• Wiring connection to the moisture sensor is loose or disconnected
• Control board failure preventing proper sensor communication
• High humidity in your laundry room affecting sensor readings
• Overloaded dryer loads preventing proper air circulation and sensor function
• Power surge damage to the sensor circuitry
• Defective thermal sensor working in conjunction with moisture sensor
Precautionary measures
• Verify the dryer is properly plugged into a grounded 240-volt outlet and the power cord shows no visible damage
• Check your home's circuit breaker panel to ensure the breaker serving the dryer has not tripped; if tripped, switch it off completely then back on
• Ensure the dryer door closes completely and latches securely with no obstructions
• Remove and clean the lint filter thoroughly, then check the filter housing for lint accumulation and wipe clean with a dry cloth
• Inspect the dryer's exhaust vent hose outside your home to confirm it is not blocked, kinked, or crushed; clear any lint or debris from the exterior vent opening
• Verify hot air is flowing from the exterior exhaust vent while the dryer is running
• Avoid overloading the dryer; use appropriate load sizes for better moisture sensing accuracy
• Confirm you are selecting the correct drying cycle for your load type
• Perform a complete reset by unplugging the dryer from the wall outlet or switching off the dedicated circuit breaker for a full 60 seconds, then restore power and attempt to run a test cycle
• Run a small load with damp towels to test if the dryer functions properly
• If the error code persists after these checks, contact a professional appliance repair technician or independent appliance repair support service to inspect and potentially replace the moisture sensor assembly
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