Rheem-Ruud 42-105601-24 Pressure Switch

As an experienced tech, you know that a failing Rheem-Ruud 42-105601-24 is often the culprit behind a furnace lockout or a fault code 57. This negative pressure switch is factory-calibrated at a -0.20" WC pressure rating, serving as a critical safety limit for verifying induced draft blower operation. Designed with a Single-Pole, Single-Throw (SPST) configuration, it monitors air displacement through the collection box to ensure combustion gases are safely exhausted before the ignition sequence begins. This genuine HVAC OEM replacement part is the current manufacturer-specified upgrade for the obsolete 42-24335-24, featuring a refined diaphragm design for better resistance to internal rubber fatigue and contact pitting. Whether you are dealing with ignition failure or short-cycling in a Rheem or Ruud gas furnace, this 0.20" WC SPST switch provides the precision required to restore system integrity. Every HVAC pressure switch in this series is built to meet UL and CSA certifications, ensuring it handles the technical demands of high-efficiency climate control equipment.

Key Benefits:

• Direct Manufacturer Replacement: Engineered to replace the legacy 42-24335-24 and 42-105601-24K models without requiring modification.
• Fixed Setpoint Precision: Factory-set at -0.20" WC to maintain strict airflow safety parameters and prevent delayed ignition.
• Industrial-Grade Construction: Features a robust casing designed to withstand the heat and vibration of the induced draft blower assembly.
• System Reliability: Eliminates nuisance trips caused by drifting setpoints in aged or generic aftermarket switches.

Common Questions:

Can I use a universal pressure switch instead of the 42-105601-24?
While universal switches exist, they often require manual calibration. Using a dedicated OEM repair part with an exact -0.20" WC rating is essential for maintaining the safety sequence of the furnace control board.

How do I troubleshoot an Error 57 or Code 45?
First, check for blocked vent pipes or a clogged condensate trap. If the draft inducer is running but the SPST switch isn't closing, use a manometer to verify the vacuum pressure before replacing the component.

Is the new design compatible with my older furnace?
Yes. Although the physical housing may look different than the original black plastic versions, the electrical specs and vacuum port connections are designed for seamless integration into existing Ruud and Rheem units.

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.