GE DCVH680GJWW Moisture Sensor – What It Does, Symptoms & How to Fix
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Understanding the Problem
Brief explanation: The moisture sensor (sometimes called the sensor bar) in your GE DCVH680GJWW detects humidity in the drum and tells the control when clothes are dry so the dryer can end the cycle or switch to a cool-down. When the sensor fails or is covered in residue the dryer will either over-dry, under-dry, or have wildly inconsistent cycle times. Diagnostic & repair steps (numbered): 1) Confirm symptoms: run a normal automatic cycle with a mix of wet and dry clothes and note if the cycle ends too early, runs excessively long, or if clothes remain damp after the cycle finishes. 2) Clean the sensor: remove the lint screen and wipe the metal sensor bars (usually located on the front bulkhead at the lint trap opening or inside the drum opening) with a soft cloth and rubbing alcohol to remove fabric softener residue. Re-run a cycle to see if behavior improves. Many “bad sensor” complaints are just dirty bars. 3) Check for error codes / control behavior: if your dryer displays F-codes or error lights, note them and consult the service manual—some codes point to wiring or control failures rather than the sensor itself. 4) Visual inspection: unplug the dryer (and turn off the gas if it’s a gas model). Pull the dryer out and remove the front/top per your model’s service steps. Inspect the sensor bars and harness for broken metal strips, corrosion, burned connectors, or damaged wires. 5) Electrical test (multimeter): disconnect the sensor harness from the control. Set a multimeter to resistance (ohms). With the sensor dry you should see a higher resistance; when you place a damp cloth across the bars the resistance should fall (sensor is a variable humidity sensor). If the resistance is open (infinite) or shows no change when wet vs dry, the sensor is faulty. 6) Verify harness and control: if the sensor checks good but the dryer still misbehaves, check the harness for continuity and for voltage at the control harness while a cycle is running (service manual wiring diagram required). A failed control board or shorted harness can mimic a bad sensor. 7) Replace the sensor: order the correct OEM replacement for your exact model (part number varies by production run). Typical replacement steps: a) Unplug dryer / shut off gas. b) Remove the top/front access panels to get to the sensor bar area (usually located near the lint trap housing). c) Unplug the sensor harness, remove the sensor mounting screws or clips, and install the new sensor. d) Reconnect harness, reassemble panels, restore power/gas, and test with a damp towel to confirm the sensor ends the cycle when dry. How to fix (practical steps): - Start with cleaning: clean the bars with a cloth and isopropyl alcohol and retest. This fixes most issues. - If cleaning doesn’t work, test with a multimeter as described. Replace the sensor if it stays open or shows no resistance change when wet. - If the sensor tests OK, inspect/replace the harness or test the control board – many diagnostics require the appliance wiring diagram and live-voltage checks, which you may want a technician to perform. Safety note: Always disconnect power at the breaker and turn off the gas supply before opening the dryer. If you’re not comfortable testing live voltages or disassembling panels, hire a qualified appliance technician.
Common Symptoms
Dryer runs too long or indefinitely, clothes still damp after automatic cycle, inconsistent cycle lengths, dryer ends too early, or displays related error codes.
Common Causes
- Sensor bars dirty or coated with fabric softener residue
- Moisture sensor (sensor bar) failed (open or no resistance change)
- Damaged wiring harness or corroded connector
- Faulty control board or input circuit not reading the sensor
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Helpful Repair Tip
Clean the metal sensor bars with rubbing alcohol and then test: if the dryer’s automatic cycle behavior immediately improves, residue (fabric softener/skin oils) was the likely cause.
Frequently Asked Questions
How do I clean the moisture sensor?
Open the lint trap and locate the two small metal sensor bars in the drum opening or on the front bulkhead. Wipe them with a soft cloth dampened with isopropyl (rubbing) alcohol or a mild, non-abrasive cleaner to remove fabric softener and residue. Dry thoroughly and run a test load. Avoid strong abrasives that can scratch the sensor bars.
Can I run the dryer without the moisture sensor?
You can operate the dryer on a timed cycle without the moisture sensor, but automatic sensing (automatic dry) will not function correctly. The dryer may run too long or too short on an automatic cycle if the sensor is disconnected. For reliable automatic drying and to avoid wasted energy or damaged clothes, replace a failed moisture sensor.
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