Applicable Systems
Serie
Symptoms
The moisture sensor is not detecting dry clothes correctly. The dryer runs for the full timed cycle even though clothes are already dry, wasting energy.
Possible Causes
- Moisture sensor bars coated with fabric softener residue, insulating the surface
- Sensor wiring harness disconnected or damaged
- Sensor board input failure on the electronic controller
- Incorrect cycle selection: timed dry selected instead of automatic dry
Troubleshooting Steps
- Step 1: Locate the moisture sensor bars inside the drum (usually near the lint filter)
Clean the bars with rubbing alcohol on a soft cloth to remove residue - Step 2: Verify the sensor wiring harness is connected and not damaged
Repair or replace damaged wiring - Step 3: Test the sensor bars with a multimeter for continuity across the bars when wet
Replace if the sensor does not show resistance change when moisture is applied - Step 4: Verify the correct cycle is selected (Auto Dry, not Timed Dry)
The moisture sensor only functions in automatic dry cycles
How to Reset
Reset: No reset required. The sensor operates correctly after cleaning and verification.
Common Replacement Parts
- Moisture sensor bar: Metal bar, OEM-specific (Match to dryer model)
- Sensor harness: 2-wire, 18 AWG (Check for heat damage near the drum)
Frequently Asked Questions
- Q: How often should I clean the moisture sensor?
Monthly, or whenever fabric softener is used. Wipe the bars with rubbing alcohol to remove the waxy residue.
- Q: How does the moisture sensor work?
Two metal bars detect the conductivity of wet clothes. When clothes are dry, conductivity drops and the controller ends the cycle.
- Q: Can I bypass the moisture sensor?
Not recommended. The sensor saves energy and prevents over-drying. If faulty, replace it.
Source: OEM Service Manual
Category: Air Dryer