Rheem-Ruud 42-105601-20 Pressure Switch

The Rheem-Ruud 42-105601-20 Pressure Switch is an essential safety component designed for specific furnace and air handler applications. This single pole single throw (SPST) switch is factory-calibrated to a -0.45" WC set point, ensuring precise monitoring of combustion blower performance and venting integrity. As the direct replacement for 42-24335-20, this genuine OEM part maintains system UL certification and prevents furnace operation during blocked flue or inducer motor failure conditions. The low-pressure furnace switch features a compact, durable housing and standard 1/4-inch spade terminals for secure electrical connections. When diagnosing furnace pressure switch stuck open codes or intermittent ignition cycles, verifying the diaphragm response and electrical continuity of this switch is a primary troubleshooting step. Designed for high-cycle reliability in demanding HVAC environments, this 0.45 inch water column switch ensures consistent pressure sensing across a wide range of operating temperatures and airflow variables.

• OEM Compatibility: Serves as the official Rheem 42-105601-20 replacement part to ensure perfect fitment and function within the heating assembly.
• Precise Calibration: Factory-set at -0.45" WC to meet strict safety parameters for induction draft systems.
• Durable Construction: Built with robust materials to withstand heat and moisture typical of furnace burner compartments.
• Simplified Installation: Plug-and-play design for HVAC pressure switch replacement, minimizing labor time during service calls.

Common Questions

Can I use a switch with a different WC rating?
No. Pressure switches must match the manufacturer's specific water column rating. Using a switch with a different set point can lead to unsafe operation or frequent system lockouts.

Will this resolve an 'Inducer Limit' fault code?
If your draft inducer pressure switch is failing to close or is fluttering due to a worn diaphragm, this OEM replacement will restore the safety circuit if the rest of the venting system is clear.

Does this switch include the sensing tubing?
This part number typically includes the pressure switch assembly itself. It is recommended to inspect your existing silicone tubing for cracks or moisture blocks when installing the new switch.

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.