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Defrost sensor limit switch L85-15F Rheem 47-23118-01

L85-15F Rheem limit switch defrost sensor 47-23118-01

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Rheem Protech limit switch used as a defrost sensor. Limit switch opens at 85 degrees Farenheit and automatically resets at 70 degrees Farenheit. Body size is 36TX11. Also known as part # 472311801 & 13648.

Rheem-Ruud 47-23118-01 SPST N/C Auto-Reset Airflow Limit Switch

Ensure precise airflow control and temperature safety in your HVAC system with the genuine Rheem-Ruud 47-23118-01 limit switch. This factory-OEM component is built to exacting standards, delivering reliable operation and long-term peace of mind.


Key Features

  • Single-Pole Single-Throw (SPST) normally closed switch

  • Automatic reset after temperature cycles

  • Opens at 85 °F and closes at 70 °F for accurate thermal protection

  • Tight temperature tolerances: ±5 °F on open, ±6 °F on close

  • Rated for 15 A at 120 VAC or 10 A at 230 VAC

  • Compact, open‐disc design for quick response

  • Flanged airstream mounting with up to 3⁄16″ insertion depth

  • Genuine Rheem-Ruud OEM packaging and part traceability


Technical Specifications

Specification Details
Switch Type SPST, Normally Closed
Open Temperature 85 °F (±5 °F)
Close Temperature 70 °F (±6 °F)
Maximum Current Rating 15 A @ 120 VAC / 10 A @ 230 VAC
Reset Mode Automatic
Disc Face Open
Mounting Style Flanged airstream
Mounting Insertion Depth 3⁄16″ max
Connection 1⁄4″ quick-connect terminals
Dimensions (L × W × H) 1.1 in × 0.75 in × 0.45 in
Weight 0.05 lb (0.246 oz)
Origin China


Applications & Compatibility

Ideal for commercial and residential furnaces, air handlers, rooftop units, and packaged systems where reliable airflow monitoring or defrost sensing is required. The 47-23118-01 integrates seamlessly into Rheem, Ruud, WeatherKing, Protech, and other OEM assemblies.


Installation & Maintenance

  1. Power down the equipment before servicing.

  2. Remove the old limit switch from its flange mounting.

  3. Insert the 47-23118-01 to the specified depth (max 3⁄16″) and secure flange.

  4. Connect using 1⁄4″ quick-connect terminals, observing polarity.

  5. Restore power and verify open/close functionality at 85 °F/70 °F thresholds.

  6. Inspect periodically for proper seating and free disc movement.

Routine checks help prevent airflow blockages and ensure the switch resets reliably after each cycle.


Why Choose Rheem-Ruud OEM?

  • Guaranteed fit and form factor for direct replacement

  • Superior material quality and performance consistency

  • Backed by Rheem’s extensive warranty and support network

  • Eliminates guesswork—authentic replacement part verified by model number

Upgrade your system with confidence, knowing you’ve chosen the exact part specified by the original equipment manufacturer.


Ready to order or need cross-reference guidance? Contact us for availability, pricing, and compatibility charts to keep your HVAC installations running smoothly.