How to Install Microwave Humidity Sensor 6501W1A013A in a Kenmore Elite Microwave

Quick answer: Unplug the microwave, remove the vent grille and top or outer cabinet, discharge the high-voltage capacitor, then unplug the humidity sensor from its harness at the cavity exhaust opening, unclip or unscrew it, fit 6501W1A013A in the same position, reconnect and test a sensor cook mode.

The humidity sensor 6501W1A013A is the small electronic sensor that lets a Kenmore Elite or LG over-the-range microwave run its sensor cook and sensor reheat programs. It sits in the airflow leaving the cooking cavity, usually near the exhaust opening at the top of the cavity, and reports the rise in moisture from the food to the control board so the microwave can decide when the dish is done. When it fails, sensor cooking stops early, runs far too long, or the display shows a sensor error while manual timed cooking still works. It replaces the earlier codes 3501W1A019C and AEJ75540901 and is listed for models such as the LMVM2033BD00, LMHM2237ST00 and LMVH1750SB00.

The part itself is simple, but it lives inside a microwave next to the high-voltage capacitor, which can hold a dangerous charge long after the plug is pulled. The manufacturer recommends a service technician for that reason. If you take it on yourself, treat the capacitor discharge as a mandatory step, not an option. This guide explains where the sensor is, what has to come off to reach it and how to prove the new one works.

See part details and every compatible model: 6501W1A013A

⚠️ Safety First
  • Unplug the microwave before removing any panel. If it is hard-wired, turn off the breaker and confirm the display is dead.
  • Discharge the high-voltage capacitor with an insulated tool across its terminals and to chassis before touching anything inside. The capacitor can retain a lethal charge even when unplugged.
  • Never operate the microwave with the cabinet off or the door interlocks bypassed.
  • Wear gloves; the cabinet and duct edges are sharp sheet metal.

Tools and Parts You Need

  • Phillips screwdriver
  • Quarter-inch nut driver
  • Insulated screwdriver with a jumper lead for discharging the capacitor
  • Needle-nose pliers
  • Flashlight
  • Work gloves

Step-by-Step Installation

  1. Unplug and remove the grille Pull the plug from the outlet in the upper cabinet. Remove the screws along the top of the vent grille, tilt it forward and lift it off to expose the top of the microwave.
  2. Remove the outer cabinet Take out the screws holding the top and side wrapper along the rear and sides, then slide the cabinet back and lift it away. On some installations it is easier to take the microwave off its wall bracket and work on a padded counter.
  3. Discharge the capacitor Locate the large cylindrical high-voltage capacitor near the transformer. Bridge both terminals together and then each terminal to the chassis with an insulated screwdriver and jumper lead. Do this twice.
  4. Locate the humidity sensor Follow the cavity exhaust path from the top of the cooking cavity toward the blower. The sensor is a small block with a two-wire or three-wire plug mounted in the airflow, held by a screw or clips.
  5. Disconnect and remove the old sensor Note the orientation, unplug the connector from the sensor lead, then remove the screw or release the clips and lift the sensor out of its opening.
  6. Install 6501W1A013A Seat the new sensor in the same opening with the sensing face toward the airflow exactly as the old one sat. Refit the screw or press the clips home and plug the harness connector in until it latches.
  7. Route the lead and reassemble Tuck the sensor lead along its original path away from the magnetron and the capacitor terminals. Slide the outer cabinet back on, replace every screw, and refit the vent grille.
  8. Test sensor cooking Plug the microwave in, place a cup of water inside and run a sensor reheat program. The microwave should detect the steam and finish on its own without a sensor error.

Fit Checks Before You Call the Job Done

  • The sensor sits flush in its opening with its sensing face in the exhaust airflow.
  • The harness connector is fully latched and the lead is clear of the magnetron and capacitor.
  • The outer cabinet is fully screwed down with no gap at the rear or sides.
  • The vent grille is seated and the door opens and closes normally.
  • A sensor cook program completes on its own without an error message.

Common Mistakes to Avoid

Skipping the capacitor discharge This is the one step that can injure you. Discharge the capacitor every time the cabinet comes off, even if the microwave has been unplugged for days.

Mounting the sensor backwards The sensing element must face the airflow. A sensor turned away from the vent reads late and sensor programs overcook.

Pinching the sensor lead under the cabinet A crushed lead shorts or opens and brings the sensor error right back. Check the wire path before the last screws go in.

Replacing the sensor for a problem it does not cause Sensor errors can also come from a blocked exhaust or a grease-clogged vent. Clean the vent path before condemning the sensor.

Troubleshooting After Installation

Sensor error still appears Check that the connector is latched and the lead is not pinched. If the new sensor reads the same, the fault is in the harness or the control board.

Sensor cooking stops after a few seconds Steam is not reaching the sensor. Make sure the vent path and grease filters are clean and the sensor face points into the airflow.

Sensor cooking runs far too long The sensor is mounted loose or facing away from the vent. Reseat it so it sits flush in the exhaust opening.

Microwave will not start after reassembly A door interlock switch or its connector was disturbed. Unplug, open the cabinet again, discharge the capacitor and check the switch wiring.

Care Tips After the Repair

  • Clean the grease filters and vent grille monthly so exhaust air flows freely past the sensor.
  • Do not start sensor cook with the door just opened; wait a minute so humidity in the cavity settles.
  • Cover foods with a vented lid so the steam that the sensor needs is released steadily.

Compatible Models (Sample)

This part is listed for 190 Kenmore Elite models in our fitment data. Always confirm your exact model number on the appliance's rating plate.

Replaces or is replaced by: 3501W1A019C, AEJ75540901

Repair Difficulty and Time

Difficulty: Advanced. Typical time: 45 to 90 minutes.

Frequently Asked Questions

Which models use 6501W1A013A?

It is listed for Kenmore Elite and LG over-the-range microwaves such as LMVM2033BD00, LMHM2237ST00, LMVH1750SB00, LSMC3086SS00 and 72185062010, and it replaces 3501W1A019C and AEJ75540901.

Why does the manufacturer say a technician should do this?

Because the high-voltage capacitor inside the microwave can hold a lethal charge even when unplugged. The sensor swap itself is easy; the danger is in opening the cabinet safely.

Does manual cooking work without the sensor?

Yes. Timed cooking, defrost by time and the turntable all work; only the sensor cook and sensor reheat programs depend on this part.

Does the microwave have to come off the wall?

Not always. If the top and side wrapper can slide back with the microwave on its bracket you can work in place, but a counter is safer if clearance is tight.

Final Checklist

  • Microwave unplugged or breaker off and display dark
  • Vent grille and outer cabinet removed
  • High-voltage capacitor discharged twice
  • Old sensor orientation noted before removal
  • New sensor seated with face in the airflow and connector latched
  • Lead routed clear of magnetron and capacitor, cabinet fully reassembled

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