🔩 Oven Temperature Sensor Replacement Repair Guide for GE JB645RKSS (Electric Range)
💡 This repair guide will be expanded with detailed instructions. Claude AI will add comprehensive explanations, safety tips, troubleshooting advice, and product recommendations.
🔍 Symptoms
Oven temp inaccurate, F2/F3 error codes, won’t reach temperature
🔧 Part Numbers
- WB21X10013
- WB20X10026
🔧 Required Tools
- Phillips screwdriver
- 1/4″ nut driver
- multimeter
✔️ Difficulty & Cost
Difficulty: Easy
Estimated Cost: $15-30
✔️ Repair Steps
Step 1: Test sensor resistance (should be ~1080 ohms at room temp)
1. Unplug the range from the wall outlet, or flip the dedicated circuit breaker labeled for the range to the OFF position at your main electrical panel.
2. Pull the range away from the wall approximately 2 feet to access the rear panel.
3. Locate the rear access panel on the back of the range – it’s a rectangular metal sheet measuring approximately 18 inches wide by 12 inches tall, positioned in the upper half of the back panel.
4. Remove the 4 screws securing the rear access panel using a Phillips-head screwdriver #2. The screws are located one in each corner, approximately 1 inch from each edge.
5. Set the panel aside and locate the oven temperature sensor probe inside the oven cavity. Open the oven door and look at the upper left rear wall of the oven interior – you’ll see a metal probe approximately 1/4 inch in diameter extending 3-4 inches into the oven cavity.
6. From the rear access opening, identify the sensor wire harness – it’s a 2-wire connector with a white plastic housing measuring approximately 1/2 inch wide. The connector is located 3-4 inches below where the sensor probe enters through the oven wall.
7. Press the locking tab on the wire connector with your thumb and pull the two halves apart. The connector separates into a male end (attached to the sensor wires) and a female end (attached to the range’s main wiring harness).
8. Set your digital multimeter to the ohms (Ω) setting at the 2000-ohm range.
9. Touch one multimeter probe to each of the two metal terminals on the male connector end coming from the sensor. The terminals are the exposed metal pins inside the white plastic connector housing.
10. Read the resistance value on the multimeter display. At 70°F room temperature, the reading should display between 1050-1110 ohms (target value is 1080 ohms).
11. If the reading shows “OL” (open line), “infinite,” or any number below 1000 ohms or above 1150 ohms, the sensor has failed and requires replacement. Proceed to Step 2.
12. If the reading falls within 1050-1110 ohms, the sensor is functioning correctly. Reconnect the wire connector by pushing the male and female ends together until you hear an audible click, then investigate other potential causes for your oven temperature issues.
Step 2: Remove oven racks
1. Open the oven door fully until it stops at approximately 90 degrees from the closed position.
2. Look inside the oven cavity and count the number of racks present (this model typically has 2 standard racks, though some units may have 1 or 3).
3. Starting with the top rack, grip it firmly with both hands—place your left hand on the left rail and your right hand on the right rail, approximately 12 inches apart.
4. Pull the rack straight toward you with steady force until it extends approximately 6-8 inches out from the oven cavity, stopping when you feel resistance from the rack stop mechanism.
5. Lift the front edge of the rack upward approximately 2 inches while continuing to pull forward—this angles the rack and clears the rack stop tabs located on the side rails.
6. Continue pulling the rack completely out of the oven cavity while maintaining the upward angle until the rear rack ends clear the mounting brackets on both sides.
7. Set the removed rack on a protected surface (such as a towel on the floor or counter) away from your work area.
8. Repeat steps 3-7 for each remaining rack in the oven, working from top to bottom.
9. Once all racks are removed, look at the left and right interior side walls of the oven—you will see metal rack support rails with multiple horizontal slots (typically 5-7 positions on each side).
10. Visually inspect these rack support rails to verify no rack glides or plastic rack stops remain attached to them, as some models have removable components that could fall during the sensor replacement process.
11. Set all removed racks aside in a location where they will not be tripped over or damaged during the repair—stacking them vertically against a wall works well if space is limited.
12. Verify the oven cavity is now completely empty by looking from the front opening straight back to the rear wall—you should see an unobstructed view of the oven bottom, back wall, and sides with only the heating elements and sensor probe (a thin metal rod protruding from the upper rear wall, approximately 4-6 inches long) remaining visible.
Step 3: Unscrew sensor bracket (usually 1-2 screws)
1. Locate the sensor bracket inside the oven cavity on the upper left rear wall, approximately 2 inches down from the top interior surface and 3 inches from the left side wall.
2. Identify the bracket as a thin metal L-shaped piece, approximately 1 inch wide, holding the sensor probe in place with either 1 or 2 hex-head screws.
3. Determine your screw configuration by visual inspection:
– Single screw models: One 1/4-inch hex-head screw positioned at the center of the bracket
– Two screw models: Two 1/4-inch hex-head screws positioned 3/4 inch apart vertically
4. Select a 1/4-inch nut driver or 1/4-inch socket with a 6-inch extension for access in the confined space.
5. Insert the nut driver onto the top screw (or the single screw in one-screw models) and rotate counterclockwise 8-10 full rotations until the screw is completely removed.
6. Place the removed screw in a container immediately to prevent loss inside the oven cavity.
7. For two-screw models, insert the nut driver onto the bottom screw and rotate counterclockwise 8-10 full rotations until completely removed.
8. Place the second screw in your container with the first screw.
9. Support the sensor probe with your non-dominant hand while removing screws to prevent the bracket from falling once the final screw releases.
10. Pull the bracket away from the oven wall approximately 1/2 inch—the bracket will remain connected to the sensor probe and wire.
11. Observe the sensor probe tip (a 3-inch metal rod, approximately 1/8 inch in diameter) now extending loosely from the mounting hole in the oven wall.
12. Note the bracket position and orientation: the longer leg of the L-bracket faces downward, and the shorter leg sits flush against the oven wall with the sensor probe passing through a small clip or loop.
13. Set the loosened bracket aside, allowing it to hang by the attached sensor wire—do not pull or tug on the wire at this point.
Success indicator: The bracket moves freely away from the wall, the sensor probe slides backward slightly from its mounting hole, and both screws are completely removed and secured for reinstallation.
Step 4: Pull sensor out, disconnect from back panel
1. Grasp the temperature sensor probe (the metal tube you loosened in the previous step) at the point where it exits the oven cavity, approximately 2 inches from the back wall.
2. Pull the sensor straight out toward you with steady pressure, sliding it through the rubber grommet in the back wall. The sensor will extend approximately 8-10 inches total length as you remove it.
3. Guide the sensor completely through the opening until you see the white wire connector emerge from the back wall. The connector is a rectangular white plastic housing measuring approximately 3/4 inch wide by 1/2 inch tall.
4. Move to the back of the range and locate where the sensor wire exits through the back panel opening, approximately 12 inches from the left side and 6 inches down from the top of the back panel.
5. Trace the wire from where it exits the back panel to the wire connector. You’ll follow approximately 8-12 inches of black or white insulated wire leading to the main wire harness.
6. Locate the temperature sensor connector plugged into the back panel wire harness. This is a white plastic connector with two metal pins inside and two wires (typically both white or one white and one brown).
7. Press the locking tab on the connector with your thumb. The tab is located on the top side of the connector and requires approximately 5 pounds of pressure to depress.
8. While holding the locking tab down, grip the connector body (not the wires) with your other hand and pull straight apart to separate the two halves. The connector will separate with approximately 1/4 inch of pulling motion.
9. Once disconnected, pull the entire sensor assembly with its attached wire completely out through the back panel opening.
10. Inspect the rubber grommet in the back wall opening. It should be a black or gray rubber ring approximately 1/2 inch in diameter. Remove this grommet by pushing it through from inside the oven cavity if it didn’t come out with the sensor.
The sensor is now completely removed. You should have in your hand a metal probe approximately 8 inches long with a wire connector on one end, and the rubber grommet separate.
Step 5: Install new sensor, ensure proper depth in oven
1. Hold the new temperature sensor (GE part #WB20T10009) with the probe tip pointing toward the oven cavity and the wire end in your hand.
2. Thread the wire connector end through the 1/2-inch diameter hole in the rear wall of the oven cavity where you removed the old sensor.
3. Push the sensor probe through the hole until the mounting bracket (the metal tab with the screw hole located 1 inch from the probe end) makes contact with the exterior oven wall.
4. Align the mounting bracket’s single hole with the threaded mounting hole in the oven wall.
5. Insert the hex head sheet metal screw (5/16-inch hex head, included with new sensor) through the mounting bracket hole.
6. Use a 1/4-inch nut driver to tighten the mounting screw clockwise until the bracket sits flush against the oven wall—approximately 3-4 full turns. The screw should be snug but not overtightened; stop when you feel moderate resistance (roughly 15-20 inch-pounds of pressure).
7. Verify proper sensor depth: Measure from the inside oven wall to the sensor tip. The probe must extend exactly 2.5 to 3 inches into the oven cavity. The tip should be approximately centered in the oven’s depth, not touching the back wall or any racks.
8. Locate the 2-pin white plastic connector attached to your new sensor wire (approximately 8 inches from the sensor probe).
9. Align the connector with the matching 2-pin female receptacle coming from the range control board that you disconnected earlier (located just outside the rear oven wall).
10. Push the connectors together firmly until you hear and feel a distinct click—this indicates the internal locking tab has engaged.
11. Gently tug on both sides of the connection; it should not separate. If it pulls apart, reconnect and push harder until the click occurs.
12. Route the sensor wire along the existing wire harness path, keeping it away from any sharp metal edges or heating elements.
13. Restore power to the range at the circuit breaker.
14. Turn the oven temperature dial to 350°F and allow the oven to preheat for 15 minutes. The oven should reach temperature and cycle off, indicating the new sensor is functioning correctly and reading accurate temperatures.
📝 Next Steps: This post will be expanded by Claude AI with:
- Detailed step-by-step instructions with explanations
- Safety warnings and precautions
- Tool recommendations and usage tips
- Troubleshooting common issues
- Product recommendations (repair kits, tools) from Amazon via Firecrawl
- Affiliate links integrated naturally into sentence form
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