Ruud Brand 62-23543-01 Furnace Flame Sensor Replacement - For Rheem, Ruud, WeatherKing, Thermal Zone, DuroGuard Furnace - 2 Pack
Two 62-23543-01 furnace flame sensors with L-shaped metal rods and white ceramic insulators.
62-23543-01 furnace flame sensor component shown with a residential furnace unit for sensitive flame detection.
62-23543-01 furnace flame sensor showing dimensions and 90-degree angle for Rheem and Ruud furnace compatibility.
Diagram of 62-23543-01 furnace flame sensor showing sensor head, ceramic porcelain, mounting bracket, and metal rod.
Two 62-23543-01 furnace flame sensors with white ceramic insulators and bent metal sensing rods.
Technician performing quick installation of 62-23543-01 furnace flame sensor with step-by-step instructions.
62-23543-01 furnace flame sensor replacement part shown against a lifestyle background with a family by a fireplace.
Two 62-23543-01 furnace flame sensors with L-shaped metal rods and white ceramic insulators.
62-23543-01 furnace flame sensor component shown with a residential furnace unit for sensitive flame detection.
62-23543-01 furnace flame sensor showing dimensions and 90-degree angle for Rheem and Ruud furnace compatibility.
Diagram of 62-23543-01 furnace flame sensor showing sensor head, ceramic porcelain, mounting bracket, and metal rod.
Two 62-23543-01 furnace flame sensors with white ceramic insulators and bent metal sensing rods.
Technician performing quick installation of 62-23543-01 furnace flame sensor with step-by-step instructions.
62-23543-01 furnace flame sensor replacement part shown against a lifestyle background with a family by a fireplace.

62-23543-01 Furnace Flame Sensor Replacement - For Rheem, Ruud, WeatherKing, Thermal Zone, DuroGuard Furnace - 2 Pack

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$11.99
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CONFIRM THIS PART FITS
Enter appliance or equipment model number to verify compatibility with this part

62-23543-01 Furnace Flame Sensor

Key Features

  • Sensing Rod Material: Metal alloy
  • Insulator Material: Alumina ceramic
  • Termination: 1/4 inch male quick connect
  • Total Length (Mounting Flange to Sensor Tip): 2-1/2 inches
  • Sensor Offset Length: 1-9/16 inches
  • Sensor Offset Angle: 90 degrees
  • Function: Detects burner flame for safe furnace operation

Replaces / Cross-Reference Part Numbers

  • 62-23543-01
  • 62-23543-02
  • 62-23543-03
  • 62-23543-04
  • PSE-RH8

Compatibility & Fitment

  • Designed for Hot Surface Ignition (HSI) and spark ignition systems
  • Compatible with gas furnaces from brands including Rheem, Ruud, WeatherKing, Thermal Zone, and DuroGuard
  • Mounts directly on the burner assembly or adjacent to the igniter

When to Replace

  • Furnace ignites but shuts down after a few seconds
  • Furnace control board indicates a flame sensor fault or error code
  • Visible carbon buildup, corrosion, or damage to the existing sensor rod

Installation Tips

  • Disconnect electrical power and shut off the gas supply to the furnace before servicing.
  • Avoid touching the metal sensor rod with bare hands; skin oils can cause premature failure. Handle with clean gloves or a cloth.
  • Handle the ceramic insulator carefully to prevent cracks or damage.
  • Ensure the sensor rod is properly positioned in the path of the flame for accurate detection.
  • Confirm all electrical connections are secure before restoring power.
Product image
Product image
  • 62-23543-01 Furnace Burner Flame Sensor

    62-23543-01 Furnace Burner Flame Sensor

    The 62-23543-01 Furnace Burner Flame Sensor monitors the burner to detect whether or not a flame is present. If the sensor does not detect a flame, it shuts the gas valve off, preventing raw gas from dumping into your home. Over time, a flame sensor may lose its ability to sense the flame, even when the flame is present.
  • Perfect Fit

    Perfect Fit

    Exact Fit For Rheem Furnace; fits models: NORGDG, SGDG, RGDJ, RGFD, RGLG, RGLH, RGLJ, RGLK, RGLL, RGLN, RGLQ, RGLR, RGPH, RGPJ, RGPK, RGPL, RGPN, RGPP, RGPQ, RGPR, RGRA, RGRB, RGRJ, RGRK, RGRL, RGRM, RGSA, RGTA, RGTJ, RGVG, RGVH, RGVJ, 80LJ, 80LS, 80PJ, 80PS, 90RJ, 90RS, 90RT, 90TJ, 90TS, RGFE, RGFG, RGLE, RGLS, RGLT, RGPE, RGPS, RGPT, RGRS, RGRT, RGTS, SGPG, SGPN
  • Premium Quality

    Premium Quality

    The product is made of strong & durable materials that prevents cracking and failing during the installation and use process.
  • Saving Solution

    Saving Solution

    Enjoy the great feeling when your furnace system is repaired and works properly like before - BlueStars brings DIY solutions to help you deal with any trouble.

Compatible Models

Locate the model number of your appliance or equipment on the manufacturer's label and use it to check compatibility before ordering

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Style
‎90° angled rod
Length (Mounting Flange to Sensor Tip)
‎2-1/2"
Sensor Offset Length
‎1-9/16"
Angle Offset
‎90°
Termination
‎1/4" male quick-connect (spade)
Material
‎Metal flame rod with alumina-ceramic insulator

FAQs

This sensor is designed for use in Rheem and Ruud gas furnaces, including the Rheem Classic 90 Plus and Rheem Criterion II series. It serves as a direct replacement for part numbers 62-23543-01, 62-23543-02, 62-23543-03, and 62-23543-04.
If your furnace burner ignites for a few seconds and then immediately shuts off, it is often a sign that the flame sensor is failing to detect the flame. This causes the control board to cut the gas supply as a safety precaution. Before replacing, ensure the sensor rod is not simply coated in carbon buildup or oxidation, which can be cleaned with a fine abrasive pad.
Replacing the sensor is a straightforward task that typically takes 10 to 15 minutes. You will generally need a 1/4-inch nut driver or a small socket set to remove the single screw holding the sensor in place. Always ensure the power to the furnace is turned off at the service switch or breaker before beginning the installation.
Flame sensors operate by proving the presence of a flame through a process called flame rectification. Over time, the metal rod accumulates carbon deposits, dust, or oxidation from the combustion process. Once this layer becomes thick enough, it acts as an insulator, preventing the sensor from completing the electrical circuit required to keep the furnace running.
No, this is not a universal part. It is specifically engineered for Rheem and Ruud systems that utilize flame rectification for ignition confirmation. It should only be used in furnaces where 62-23543-01 or its cross-referenced numbers (62-23543-02, 62-23543-03, 62-23543-04) are specified.