Rheem-Ruud 47-22861-01K Limit Switch

The Rheem-Ruud 47-22861-01K is an essential manual reset limit switch designed for furnace high limit safety and high-temperature protection. This OEM Rheem replacement part features a critical 350°F opening threshold, serving as a primary thermal failsafe to prevent heat exchanger damage and hazardous operating conditions in residential and commercial equipment. Engineered for precise HVAC safety control, this switch is a direct replacement for the earlier 47-22861-01 and is common in Rheem, Ruud, WeatherKing, and Thermal Zone air handlers and furnaces.

As a high-temperature limit switch with an SPST normally-closed configuration, it monitors internal cabinet temperatures and breaks the 24V or 120/230V circuit to the gas valve or controller if airflow becomes restricted. The manual reset requirement is a strategic design feature, forcing a field inspection to identify root causes like a failed blower motor, obstructed return air, or heavily fouled filters before the system can be fired again. This flanged airstream mount component ensures the unit maintains safe operation within factory-specified temperature rises.

• OEM Compatibility: Specifically designed for Rheem, Ruud, and WeatherKing gas heating equipment.
• High-Limit Protection: Rated for a 350°F cutout to protect the heat exchanger from thermal stress.
• Field Safety Reset: Manual button ensures technician verification after a trip event to prevent repetitive cycling under fault conditions.
• Cross-Reference Reliable: Officially replaces and upgrades the 47-22861-01 part number.
• Durable SPST Design: Snap-action contacts rated for reliable switching in 120/230V AC applications.

• What causes a 350°F limit switch to trip? Typically, a trip is triggered by severe airflow restrictions such as a failed indoor blower motor, dirty evaporator coils, or a completely blocked filter.
• Can I bypass this switch for testing? Never bypass a safety limit during normal operation. If the switch is open, it indicates an unsafe temperature condition that must be diagnosed by a professional.
• Where is this switch located in the furnace? It is typically mounted on the blower housing or the burner vestibule panel where it can accurately monitor the air temperature.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.